1. Species Polysiphonia abscissa J.D.Hooker & Harvey, 1845
2. Species Polysiphonia abscissoides Womersley, 1979
3. Species Polysiphonia acanthina J.Agardh, 1863
4. Species Polysiphonia acroblasta Kützing
5. Species Polysiphonia acrolepta Zanardini ex A.De Toni
6. Species Polysiphonia acuminata N.L.Gardner, 1927
7. Species Polysiphonia adamsiae Womersley, 1979
8. Species Polysiphonia adsendens Meneghini, 1844
9. Species Polysiphonia agardhiana Greville
10. Species Polysiphonia allochroa (Roth) Duby, 1830
11. Species Polysiphonia amentacea (C.Agardh) Montagne
12. Species Polysiphonia amphibia Harvey
13. Species Polysiphonia amphibolis Womersley, 1979
14. Species Polysiphonia anisogona J.D.Hooker & Harvey, 1845
15. Species Polysiphonia anomala Hollenberg, 1968
16. Species Polysiphonia arachnoidea (C.Agardh) Zanardini, 1840
17. Species Polysiphonia arctica J.Agardh, 1863
18. Species Polysiphonia arenaria Kützing
19. Species Polysiphonia arenaria Harvey
20. Species Polysiphonia arenicola Kützing
21. Species Polysiphonia asperula Kützing
22. Species Polysiphonia asperula (Kützing) Kützing
23. Species Polysiphonia atlantica Kapraun & J.N.Norris, 1982
24. Species Polysiphonia atra Zanardini, 1847
25. Species Polysiphonia atricapilla J.Agardh, 1863
26. Species Polysiphonia atrorubens (Wahlenberg) Endlicher
27. Species Polysiphonia attenuata Zanardini
28. Species Polysiphonia aurantiaca Kützing
29. Species Polysiphonia australiensis Womersley, 1979
30. Species Polysiphonia awabiensis Noda
31. Species Polysiphonia azorica O.C.Schmidt, 1929
32. Species Polysiphonia baileyi (Harvey) J.Agardh
33. Species Polysiphonia bambusina Meneghini
34. Species Polysiphonia banyulensis Coppejans, 1976
35. Species Polysiphonia barbatula Kützing, 1849
36. Species Polysiphonia baxteri A.H.S.Lucas, 1935
37. Species Polysiphonia beaudettei Hollenberg, 1961
38. Species Polysiphonia beguinotii Schiffner & Vatova, 1938
39. Species Polysiphonia beltoniorum Huisman, 2018
40. Species Polysiphonia biasolettiana Zanardini
41. Species Polysiphonia bicornis Ohta, 1973
42. Species Polysiphonia biformis Zanardini, 1860
43. Species Polysiphonia bifurcata Hollenberg, 1945
44. Species Polysiphonia binderi Bonder
45. Species Polysiphonia binderi (J.Agardh) Goebel
46. Species Polysiphonia binneyi Harvey, 1853
47. Species Polysiphonia boergesenii Baardseth, 1941
48. Species Polysiphonia breviarticulata (C.Agardh) Zanardini, 1840
49. Species Polysiphonia brevisegmenta Womersley, 1979
50. Species Polysiphonia caespitosa (M.A.Pocock) Hollenberg, 1968
51. Species Polysiphonia callithamnioides P.Crouan & H.Crouan, 1865
52. Species Polysiphonia camerunensis Pilger, 1911
53. Species Polysiphonia capucina P.Crouan & H.Crouan, 1865
54. Species Polysiphonia caramiiformis P.L.Crouan & H.M.Crouan
55. Species Polysiphonia carettia Hollenberg, 1971
56. Species Polysiphonia castagnei Kützing, 1863
57. Species Polysiphonia castelliana De Notaris & L.Dufour, 1865
58. Species Polysiphonia caulescens J.Agardh, 1896
59. Species Polysiphonia cladorhiza Ardissone, 1864
60. Species Polysiphonia cladorrhiza Ardissone, 1864
61. Species Polysiphonia clevelandii Farlow
62. Species Polysiphonia coacta C.K.Tseng, 1944
63. Species Polysiphonia coccinea (Hudson) Sprengel
64. Species Polysiphonia codicola Zanardini ex Frauenfeld, 1855
65. Species Polysiphonia cokeri Hollenberg
66. Species Polysiphonia corallicola Grunow
67. Species Polysiphonia corinaldii (Meneghini) De Notaris
68. Species Polysiphonia corinaldii (Meneghini) De Notaris, 1846
69. Species Polysiphonia corymbosa J.Agardh, 1863
70. Species Polysiphonia crassa Okamura, 1902
71. Species Polysiphonia crassicollis Børgesen, 1939
72. Species Polysiphonia crassiuscula Harvey, 1859
73. Species Polysiphonia curta Montagne, 1843
74. Species Polysiphonia dachenensis S.-D.Xiang, 2007
75. Species Polysiphonia dalmatica Meneghini, 1844
76. Species Polysiphonia dasyiformis (Kützing) Zanardini, 1862
77. Species Polysiphonia dasyoeformis P.L.Crouan & H.M.Crouan, 1865
78. Species Polysiphonia daveyae Reinbold, 1899
79. Species Polysiphonia decipiens Montagne, 1842
80. Species Polysiphonia decussata Hollenberg, 1942
81. Species Polysiphonia delicata Díaz-Tapia, 2017
82. Species Polysiphonia delicatula Hollenberg, 1968
83. Species Polysiphonia denticulata Delle Chiaje, 1829
84. Species Polysiphonia denticulata Kützing, 1843
85. Species Polysiphonia derbesii Solier ex Kützing, 1849
86. Species Polysiphonia deschampsii (Agardh) P.L.Crouan & H.M.Crouan
87. Species Polysiphonia determinata (Hollenberg) Savoie & G.W.Saunders, 2019
88. Species Polysiphonia deusta (Roth) Sprengel, 1827
89. Species Polysiphonia devoniensis Maggs & Hommersand, 1993
90. Species Polysiphonia dichotoma Kützing, 1843
91. Species Polysiphonia dictyura Liebmann ex Kützing, 1849
92. Species Polysiphonia dillwynii Kützing
93. Species Polysiphonia dillwynii (Kützing) Kützing
94. Species Polysiphonia divergens J.Agardh, 1842
95. Species Polysiphonia dokdoensis D.E.Bustamante, B.Y.Won & T.O.Cho, 2014
96. Species Polysiphonia donghaeya B.Kim & M.S.Kim, 2015
97. Species Polysiphonia dotyi Hollenberg, 1968
98. Species Polysiphonia dumosa J.D.Hooker & Harvey, 1845
99. Species Polysiphonia echigoensis Noda, 1975
100. Species Polysiphonia episcopalis Zanardini
101. Species Polysiphonia erythraea Schousboe ex J.Agardh
102. Species Polysiphonia exigua Kützing, 1843
103. Species Polysiphonia exilis Harvey, 1853
104. Species Polysiphonia fasciculata Harvey ex Moore, 1837
105. Species Polysiphonia fasciculifera Kützing
106. Species Polysiphonia fernandeziana M.P.Reis, 1977
107. Species Polysiphonia ferox J.Agardh
108. Species Polysiphonia figariana Zanardini, 1858
109. Species Polysiphonia firma Zanardini
110. Species Polysiphonia flabelliformis J.D.Hooker & Harvey, 1845
111. Species Polysiphonia flabellulata Harvey, 1860
112. Species Polysiphonia flaccida Rabenhorst
113. Species Polysiphonia flagellifera Reinsch
114. Species Polysiphonia flexella (C.Agardh) J.Agardh, 1842
115. Species Polysiphonia flexicaulis (Harvey) F.S.Collins, 1911
116. Species Polysiphonia flocculosa (C.Agardh) Endlichter, 1843
117. Species Polysiphonia foeniculacea (C.Agardh) Sprengel, 1827
118. Species Polysiphonia forfex Harvey, 1859
119. Species Polysiphonia fragilis Suringar, 1867
120. Species Polysiphonia funebris De Notaris ex J.Agardh, 1851
121. Species Polysiphonia funicularis Meneghini
122. Species Polysiphonia funicularis (Meneghini ex Kützing) Kützing
123. Species Polysiphonia fuscorubens J.D.Hooker & Harvey, 1847
124. Species Polysiphonia gaudichaudii (C.Agardh) Kützing
125. Species Polysiphonia gelidii Zanardini, 1874
126. Species Polysiphonia gemmifera Yates
127. Species Polysiphonia giraudii Derb. & Sol.
128. Species Polysiphonia gonatophora Kützing
129. Species Polysiphonia gracilis C.K.Tseng, 1944
130. Species Polysiphonia guadalupensis Setchell & N.L.Gardner, 1930
131. Species Polysiphonia guernisacii (P.L.Crouan & H.M.Crouan) J.Agardh, 1863
132. Species Polysiphonia hapalacantha Harvey, 1853
133. Species Polysiphonia haplodasyae Womersley, 1979
134. Species Polysiphonia hassleri W.R.Taylor, 1939
135. Species Polysiphonia havanensis Montagne, 1837
136. Species Polysiphonia havaniensis
137. Species Polysiphonia hemisphaerica Areschoug, 1875
138. Species Polysiphonia herpa Hollenberg, 1968
139. Species Polysiphonia hirsuta (Roth) Wallroth
140. Species Polysiphonia hirsuta Zanardini
141. Species Polysiphonia hirta J.Agardh, 1842
142. Species Polysiphonia hochstetteriana O.C.Schmidt, 1929
143. Species Polysiphonia hollenbergii J.N.Norris, 2014
144. Species Polysiphonia homoia Setchell & N.L.Gardner, 1930
145. Species Polysiphonia implexa J.D.Hooker & Harvey, 1845
146. Species Polysiphonia indigena Hollenberg, 1958
147. Species Polysiphonia infestans Harvey, 1855
148. Species Polysiphonia isogona Harvey, 1855
149. Species Polysiphonia jacobii De Notaris
150. Species Polysiphonia kampsaxii Børgesen, 1939
151. Species Polysiphonia kappannae Sreenivasa Rao, 1967
152. Species Polysiphonia kapraunii B.Stuercke & D.W.Freshwater, 2010
153. Species Polysiphonia kieliana Kaminski & Nizamuddin, 1975
154. Species Polysiphonia kotschyana Grunow, 1868
155. Species Polysiphonia kowiensis Stegenga, Bolton & R.J.Anderson, 1997
156. Species Polysiphonia leptothrix Zanardini
157. Species Polysiphonia letestui P.Dangeard, 1986
158. Species Polysiphonia linocladia Kützing
159. Species Polysiphonia lophura Kützing
160. Species Polysiphonia lophuroides Kützing
161. Species Polysiphonia lubrica (C.Agardh) Zanardini
162. Species Polysiphonia lusitanica Montagne ex Kützing
163. Species Polysiphonia luxurians (Agardh) par
164. Species Polysiphonia macounii Hollenberg, 1942
165. Species Polysiphonia macra Harvey, 1855
166. Species Polysiphonia macrocarpa (C.Agardh) Sprengel, 1827
167. Species Polysiphonia marchantiae Setchell & N.L.Gardner, 1924
168. Species Polysiphonia marrowii Harvey
169. Species Polysiphonia meneghiniana De Notaris
170. Species Polysiphonia micrantha Zanardini
171. Species Polysiphonia mollis Hooker f. & Harvey, 1847
172. Species Polysiphonia morisiana J.Agardh, 1842
173. Species Polysiphonia mottei Lauret, 1967
174. Species Polysiphonia muninsula B.Kim & M.S.Kim, 2015
175. Species Polysiphonia namibiensis Stegenga & Engeldow, 1997
176. Species Polysiphonia nathanielii Hollenberg, 1958
177. Species Polysiphonia nebulosa Zanardini
178. Species Polysiphonia neglecta Bornet, 2002
179. Species Polysiphonia nhatrangense P.H.Hô, 1969
180. Species Polysiphonia nhatrangensis P.H.Hô, 1969
181. Species Polysiphonia nigrella P.L.Crouan & H.M.Crouan
182. Species Polysiphonia nitens Meneghini
183. Species Polysiphonia nizamuddinii Farooqui & Begum, 1978
184. Species Polysiphonia nodifera Kützing
185. Species Polysiphonia nodulosa J.Agardh, 1842
186. Species Polysiphonia notarisii Meneghini
187. Species Polysiphonia ocellata Gratel.
188. Species Polysiphonia opaca (C.Agardh) Moris & De Notaris, 1839
189. Species Polysiphonia orbigniana Kützing
190. Species Polysiphonia ornata J.Agardh, 1842
191. Species Polysiphonia orthocarpa Rosenvinge, 1924
192. Species Polysiphonia pacifica Hollenberg, 1942
193. Species Polysiphonia pantophloea Kützing
194. Species Polysiphonia paradoxa Thuret, 1876
195. Species Polysiphonia parthasarathyae Sreenivasa Rao
196. Species Polysiphonia parthasarathyi Sreenivasa Rao, 1967
197. Species Polysiphonia parvula Suhr ex Kützing, 1864
198. Species Polysiphonia parvula (C.Agardh) Montagne, 1846
199. Species Polysiphonia pennata (Roth.) Falkenberg
200. Species Polysiphonia perforans Cormaci, G.Furnari, Pizzuto & Serio, 1998
201. Species Polysiphonia periclados (C.Agardh) Endlicher
202. Species Polysiphonia pernacola N.M.Adams, 1991
203. Species Polysiphonia perriniae Womersley, 1979
204. Species Polysiphonia peucedanoides (Bonnem.) P.L.Crouan & H.M.Crouan
205. Species Polysiphonia pilosa (F.L.Naccari) G.Zanardini
206. Species Polysiphonia platyspira Kützing
207. Species Polysiphonia plectrocarpa C.W.Schneider, 1998
208. Species Polysiphonia poko Hollenberg, 1968
209. Species Polysiphonia polycarpa Kützing
210. Species Polysiphonia polychotoma Kützing
211. Species Polysiphonia polychroma G.Martens, 1871
212. Species Polysiphonia polyrhiza Kützing
213. Species Polysiphonia polyspora (C.Agardh) Montagne, 1840
214. Species Polysiphonia porphyroides Kützing, 1849
215. Species Polysiphonia profunda Hollenberg, 1968
216. Species Polysiphonia propagulifera Womersley, 1979
217. Species Polysiphonia pulvinata (Roth) Sprengel, 1827
218. Species Polysiphonia purpurascens Harvey
219. Species Polysiphonia purpureocoerulea Sonder
220. Species Polysiphonia pygmaea Kützing, 1845
221. Species Polysiphonia quadrata Hollenberg, 1968
222. Species Polysiphonia radiata Díaz-Tapia, 2017
223. Species Polysiphonia raineriana (Zanardini) Zanardini
224. Species Polysiphonia ramentacea Harvey, 1853
225. Species Polysiphonia recurva (C.Agardh) Sprengel
226. Species Polysiphonia requienii Montagne ex Kützing, 1849
227. Species Polysiphonia rhunensis Thuret, 1878
228. Species Polysiphonia rigens (C.A.Agardh) G.Zanardini
229. Species Polysiphonia rigidula Kützing, 1847
230. Species Polysiphonia rubrorhiza Hollenberg, 1968
231. Species Polysiphonia rudis J.D.Hooker & Harvey, 1845
232. Species Polysiphonia rugulosa Kützing
233. Species Polysiphonia rutilans Kützing, 1849
234. Species Polysiphonia saccorhiza (Collins & Hervey) Hollenberg, 1968
235. Species Polysiphonia sadoensis Noda, 1963
236. Species Polysiphonia sanguinea (C.Agardh) Zanardini, 1840
237. Species Polysiphonia saxicola G.Zanardini
238. Species Polysiphonia scopulorum Harvey, 1855
239. Species Polysiphonia senticulosa Harvey, 1862
240. Species Polysiphonia serpens (Dufour) De Notaris ex Ardissone
241. Species Polysiphonia sertularioides (Grateloup) J.Agardh, 1863
242. Species Polysiphonia setigera Kützing, 1849
243. Species Polysiphonia shepherdii Womersley, 1979
244. Species Polysiphonia siamensis V.Martens
245. Species Polysiphonia simplicifilum J.Agardh
246. Species Polysiphonia sinicola Setchell & Gardner, 1924
247. Species Polysiphonia solieri J.Agardh
248. Species Polysiphonia sonorensis Hollenberg, 1942
249. Species Polysiphonia souriei Feldmann
250. Species Polysiphonia sphacelarioides J.Agardh, 1885
251. Species Polysiphonia sphaerospora Børgesen
252. Species Polysiphonia spinella C.Agardh, 1820
253. Species Polysiphonia spinescens Montagne
254. Species Polysiphonia spinosa (C.Agardh) J.Agardh, 1842
255. Species Polysiphonia spinulifera Reinsch, 1875
256. Species Polysiphonia stictophlaea Kützing
257. Species Polysiphonia stricta (Mertens ex Dillwyn) Greville, 1824
258. Species Polysiphonia strictioides (Lyngbye) Derb. & Sol.
259. Species Polysiphonia stuposa Zanardini ex Kützing, 1864
260. Species Polysiphonia subcontorta C.H.Peck, 1872
261. Species Polysiphonia subtilis De Notaris, 1841
262. Species Polysiphonia subtilis Ardissone, 1863
263. Species Polysiphonia subtilissima Montagne, 1840
264. Species Polysiphonia subulata (Ducluzeau) Kützing, 1863
265. Species Polysiphonia succulenta Harvey, 1859
266. Species Polysiphonia sulcata Rudolphi, 1831
267. Species Polysiphonia tapinocarpa Suringar, 1867
268. Species Polysiphonia tenerrima Kützing, 1843
269. Species Polysiphonia tenuistriata J.D.Hooker & Harvey, 1845
270. Species Polysiphonia tinctoria De Notaris
271. Species Polysiphonia tinctoria Zanardini
272. Species Polysiphonia tokidae Segi, 1951
273. Species Polysiphonia triton P.C.Silva, 1987
274. Species Polysiphonia tsudana Hollenberg, 1968
275. Species Polysiphonia tuberosa Hollenberg, 1968
276. Species Polysiphonia turgidula P.L.Crouan & H.M.Crouan
277. Species Polysiphonia tuticorinensis Børgesen, 1938
278. Species Polysiphonia ulex Derbes & Solier
279. Species Polysiphonia ulleungensis D.E.Bustamante, B.Y.Won & T.O.Cho, 2014
280. Species Polysiphonia uncinata Kützing, 1843
281. Species Polysiphonia uncinata (Bonnemaison) P.Crouan & H.Crouan, 1852
282. Species Polysiphonia unguiformis Børgesen, 1937
283. Species Polysiphonia urbanoides Levring, 1944
284. Species Polysiphonia urceoleta
285. Species Polysiphonia utricularis Zanardini, 1851
286. Species Polysiphonia vaga Kützing
287. Species Polysiphonia vaga (Kützing) Kützing
288. Species Polysiphonia variabilis Harvey, 1855
289. Species Polysiphonia variabilis Hooker fil. & Harvey, 1863
290. Species Polysiphonia villifera (C.Agardh) Endlicher
291. Species Polysiphonia villum J.Agardh, 1863
292. Species Polysiphonia vinosa Kützing
293. Species Polysiphonia violaceum
294. Species Polysiphonia wulfenii Kützing, 1843
295. Species Polysiphonia zanardinii Schiffner
296. Species Polysiphonia acanthophora Kützing, 1843 accepted as Neosiphonia sertularioides (Grateloup) K.W.Nam & P.J.Kang, 2012 accepted as Polysiphonia sertularioides (Grateloup) J.Agardh, 1863
297. Species Polysiphonia acanthophora Harvey, 1844 accepted as Echinothamnion hookeri (Harvey) Kylin ex P.C.Silva, 1996
298. Species Polysiphonia acanthotricha Kützing, 1847 accepted as Polysiphonia flexella (C.Agardh) J.Agardh, 1842 (synonym)
299. Species Polysiphonia aculeata (C.Agardh) Fries, 1845 accepted as Leptosiphonia fibrillosa (Agardh) Savoie & G.W.Saunders, 2019
300. Species Polysiphonia aculeifera Zanardini, 1847 accepted as Polysiphonia opaca (C.Agardh) Moris & De Notaris, 1839 (synonym)
301. Species Polysiphonia adunca Kützing, 1849 accepted as Lophosiphonia reptabunda (Suhr) Kylin, 1956 accepted as Vertebrata reptabunda (Suhr) Díaz-Tapia & Maggs, 2017
302. Species Polysiphonia affinis Moore, 1837 accepted as Vertebrata fucoides (Hudson) Kuntze, 1891 (synonym)
303. Species Polysiphonia aggregata Segi, 1944 accepted as Neosiphonia savatieri (Hariot) M.S.Kim & I.K.Lee, 1999 accepted as Melanothamnus savatieri (Hariot) Díaz-Tapia & Maggs, 2017
304. Species Polysiphonia akkeshiensis Segi, 1951 accepted as Melanothamnus akkeshiensis (Segi) A.M.Saunders & G.W.Saunders, 2019
305. Species Polysiphonia amoena Sonder, 1855 accepted as Polysiphonia isogona Harvey, 1855
306. Species Polysiphonia amplacapilli B.Kim & M.S.Kim, 2014 accepted as Kapraunia amplacapilli (B.Kim & M.S.Kim) Savoie & G.W.Saunders, 2019
307. Species Polysiphonia angustissima Kützing, 1864 accepted as Polysiphonia subtilissima Montagne, 1840
308. Species Polysiphonia apiculata Hollenberg, 1968 accepted as Melanothamnus apiculatus (Hollenberg) Díaz- Tapia & Maggs, 2017
309. Species Polysiphonia aquamara I.A.Abbott, 1947 accepted as Neosiphonia tongatensis (Harvey ex Kützing) M.-S.Kim & I.K.Lee, 1999 accepted as Melanothamnus tongatensis (Harvey ex Kützing) Díaz-Tapia & Maggs, 2017
310. Species Polysiphonia arborescens Kützing, 1843 accepted as Carradoriella elongata (Hudson) Savoie & G.W.Saunders, 2019 (synonym)
311. Species Polysiphonia argentinica W.R.Taylor, 1939 accepted as Neosiphonia harveyi (Bailey) M.-S.Kim, H.-G.Choi, Guiry & G.W.Saunders, 2001 accepted as Melanothamnus harveyi (Bailey) Díaz-Tapia & Maggs, 2017
312. Species Polysiphonia argus Kützing, 1864 accepted as Herposiphonia versicolor (Hooker & Harvey) Reinbold, 1899
313. Species Polysiphonia armata J.Agardh, 1842 accepted as Polysiphonia subulifera (C.Agardh) Harvey, 1834 accepted as Vertebrata subulifera (C.Agardh) Kuntze, 1891
314. Species Polysiphonia aterrima J.D.Hooker & Harvey, 1845 accepted as Vertebrata aterrima (J.Hooker & Harvey) Kuntze, 1891
315. Species Polysiphonia atropurpurea Moore, 1837 accepted as Vertebrata fucoides (Hudson) Kuntze, 1891
316. Species Polysiphonia atrorubescens (Dillwyn) Greville, 1824 accepted as Polysiphonia nigra (Hudson) Batters, 1902 accepted as Vertebrata nigra (Hudson) Díaz-Tapia & Maggs, 2017
317. Species Polysiphonia aurata Harvey, 1855 accepted as Tiparraria aurata (Harvey) Womersley, 2003
318. Species Polysiphonia australis (C.Agardh) J.Agardh, 1863 accepted as Brongniartella australis (C.Agardh) F.Schmitz, 1893 accepted as Vertebrata australis (C.Agardh) Kuntze, 1891
319. Species Polysiphonia badia (Dillwyn) Sprengel, 1827 accepted as Polysiphonia nigra (Hudson) Batters, 1902 accepted as Vertebrata nigra (Hudson) Díaz-Tapia & Maggs, 2017
320. Species Polysiphonia badia Kützing, 1849 accepted as Neosiphonia sertularioides (Grateloup) K.W.Nam & P.J.Kang, 2012 accepted as Polysiphonia sertularioides (Grateloup) J.Agardh, 1863
321. Species Polysiphonia bajacali Hollenberg, 1961 accepted as Melanothamnus bajacali (Hollenberg) Díaz-Tapia & Maggs, 2017 (synonym)
322. Species Polysiphonia balanicola Falkenberg, 1901 accepted as Polysiphonia funebris De Notaris ex J.Agardh, 1851
323. Species Polysiphonia bangi Kützing, 1849 accepted as Brongniartella byssoides (Goodenough & Woodward) F.Schmitz, 1893 accepted as Vertebrata byssoides (Goodenough & Woodward) Kuntze, 1891
324. Species Polysiphonia bangii (Kützing) Kützing, 1864 accepted as Brongniartella byssoides (Goodenough & Woodward) F.Schmitz, 1893 accepted as Vertebrata byssoides (Goodenough & Woodward) Kuntze, 1891
325. Species Polysiphonia bartlingiana Kützing, 1843 accepted as Symphyocladiella bartlingiana (Kützing) D.Bustamante, B.Y.Won & T.O.Cho, 2019
326. Species Polysiphonia beguinottii Schiffner, 1938 accepted as Polysiphonia beguinotii Schiffner & Vatova, 1938
327. Species Polysiphonia berkeleyi (Montagne) J.D.Hooker, 1847 accepted as Heterosiphonia berkeleyi Montagne, 1842
328. Species Polysiphonia bharadwajae Sreenivasa Rao, 1967 accepted as Polysiphonia ferulacea Suhr ex J.Agardh, 1863 accepted as Melanothamnus ferulaceus (Suhr ex J.Agardh) Díaz-Tapia & Maggs, 2017
329. Species Polysiphonia biasolettoana Zanardini, 1841 accepted as Polysiphonia deusta (Roth) Sprengel, 1827
330. Species Polysiphonia biasolettoana (C.Agardh) J.Agardh, 1842 accepted as Polysiphonia deusta (Roth) Sprengel, 1827
331. Species Polysiphonia bipinnata Postels & Ruprecht, 1840 accepted as Savoiea bipinnata (Postels & Ruprecht) M.J.Wynne, 2018
332. Species Polysiphonia blandii Harvey, 1862 accepted as Melanothamnus blandii (Harvey) Diaz-Tapia & Maggs, 2017
333. Species Polysiphonia boldii M.J.Wynne & P.Edwards, 1970 accepted as Polysiphonia hemisphaerica var. boldii (M.J.Wynne & P.Edwards) Rueness, 1973 (synonym)
334. Species Polysiphonia bostrychioides P.L.Crouan & H.M.Crouan, 1865 accepted as Bostrychia moritziana (Sonder ex Kützing) J.Agardh, 1863
335. Species Polysiphonia botryocarpa J.D.Hooker & Harvey, 1845 accepted as Microcolax botryocarpus (J.D.Hooker & Harvey) F.Schmitz, 1897
336. Species Polysiphonia brodiaei (Dillwyn) Sprengel, 1827 accepted as Polysiphonia brodiei (Dillwyn) Sprengel, 1827 accepted as Leptosiphonia brodiei (Dillwyn) A.M.Savoie & G.W.Saunders, 2019
337. Species Polysiphonia brodiei (Dillwyn) Sprengel, 1827 accepted as Leptosiphonia brodiei (Dillwyn) A.M.Savoie & G.W.Saunders, 2019
338. Species Polysiphonia bulbosa Fries, 1845 accepted as Leptosiphonia fibrillosa (Agardh) Savoie & G.W.Saunders, 2019 (synonym)
339. Species Polysiphonia byssacea (Kützing) Kützing, 1864 accepted as Polysiphonia byssoides var. byssacea Kützing, 1843 (synonym)
340. Species Polysiphonia byssoclados Harvey, 1844 accepted as Brongniartella australis (C.Agardh) F.Schmitz, 1893 accepted as Vertebrata australis (C.Agardh) Kuntze, 1891
341. Species Polysiphonia byssoides (Goodenough & Woodward) Greville, 1824 accepted as Brongniartella byssoides (Goodenough & Woodward) F.Schmitz, 1893 accepted as Vertebrata byssoides (Goodenough & Woodward) Kuntze, 1891
342. Species Polysiphonia caespitosa S.-D.Xiang, 2004 accepted as Polysiphonia dachenensis S.-D.Xiang, 2007
343. Species Polysiphonia caespitula Sonder, 1855 accepted as Polysiphonia decipiens Montagne, 1842
344. Species Polysiphonia calacantha Harvey, 1859 accepted as Tolypiocladia glomerulata (C.Agardh) F.Schmitz, 1897
345. Species Polysiphonia californica Harvey, 1853 accepted as Polysiphonia paniculata Montagne, 1842 accepted as Eutrichosiphonia paniculata (Montagne) D.E.Bustamante & T.O.Cho, 2021
346. Species Polysiphonia callithamnion Sonder, 1845 accepted as Polysiphonia callithamnium Sonder, 1845 accepted as Heterosiphonia callithamnium (Sonder) Falkenberg, 1901
347. Species Polysiphonia callithamnium Sonder, 1845 accepted as Heterosiphonia callithamnium (Sonder) Falkenberg, 1901
348. Species Polysiphonia calodictyon Harvey ex Kützing, 1864 accepted as Tolypiocladia calodictyon (Harvey ex Kützing) P.C.Silva, 1952
349. Species Polysiphonia calothrix Harvey, 1855 accepted as Herposiphonia calothrix (Harvey) Womersley, 2003
350. Species Polysiphonia campanulata Delle Chiaje, 1829 accepted as Rytiphlaea tinctoria (Clemente) C.Agardh, 1824 (synonym)
351. Species Polysiphonia camptoclada Montagne, 1837 accepted as Streblocladia camptoclada (Montagne) Falkenberg, 1901
352. Species Polysiphonia cancellata Harvey, 1844 accepted as Polysiphonia decipiens Montagne, 1842
353. Species Polysiphonia carmichaeliana Harvey, 1833 accepted as Leptosiphonia fibrillosa (Agardh) Savoie & G.W.Saunders, 2019 (synonym)
354. Species Polysiphonia caspia Kützing, 1843 accepted as Polysiphonia ornata J.Agardh, 1842 (synonym)
355. Species Polysiphonia caspica Kützing, 1843 accepted as Polysiphonia ornata J.Agardh, 1842
356. Species Polysiphonia ceramiiformis P.Crouan & H.Crouan, 1867 accepted as Vertebrata simulans (Harvey) Kuntze, 1891
357. Species Polysiphonia ceratoclada Montagne, 1842 accepted as Herposiphonia ceratoclada (Montagne) Reinbold, 1899
358. Species Polysiphonia cervicornis Kützing, 1847 accepted as Bryocladia cervicornis (Kützing) F.Schmitz, 1897
359. Species Polysiphonia chalarophloea Kützing, 1849 accepted as Carradoriella elongata (Hudson) Savoie & G.W.Saunders, 2019 (synonym)
360. Species Polysiphonia chrysoderma Kützing, 1849 accepted as Polysiphonia breviarticulata (C.Agardh) Zanardini, 1840
361. Species Polysiphonia cladostephus Montagne, 1843 accepted as Brongniartella australis (C.Agardh) F.Schmitz, 1893 accepted as Vertebrata australis (C.Agardh) Kuntze, 1891
362. Species Polysiphonia clavigera Kützing, 1849 accepted as Carradoriella elongata (Hudson) Savoie & G.W.Saunders, 2019
363. Species Polysiphonia cloiophylla (C.Agardh) J.Agardh, 1863 accepted as Pterosiphonia cloiophylla (C.Agardh) Falkenberg, 1897
364. Species Polysiphonia coarctata Kützing, 1849 accepted as Polysiphonia furcellata (C.Agardh) Harvey, 1833 accepted as Vertebrata furcellata (C.Agardh) Kuntze, 1891
365. Species Polysiphonia colensoi J.D.Hooker & Harvey, 1855 accepted as Metamorphe colensoi (J.D.Hooker & Harvey) Falkenberg, 1897
366. Species Polysiphonia collabens (C.Agardh) Kützing, 1849 accepted as Melanothamnus collabens (C.Agardh) Díaz-Tapia & Maggs, 2017
367. Species Polysiphonia collinsii Hollenberg, 1944 accepted as Vertebrata hendryi (N.L.Gardner) Savoie & G.W.Saunders, 2019
368. Species Polysiphonia comatula Kützing, 1849 accepted as Boergeseniella fruticulosa (Wulfen) Kylin, 1956 accepted as Vertebrata fruticulosa (Wulfen) Kuntze, 1891
369. Species Polysiphonia commutata Kützing, 1849 accepted as Carradoriella elongata (Hudson) Savoie & G.W.Saunders, 2019 (synonym)
370. Species Polysiphonia comoides Harvey, 1855 accepted as Polysiphonia isogona Harvey, 1855
371. Species Polysiphonia comosa J.D.Hooker & Harvey, 1845 accepted as Lophurella comosa (J.D.Hooker & Harvey) Falkenberg, 1901
372. Species Polysiphonia comosa Kützing, 1843 accepted as Boergeseniella fruticulosa (Wulfen) Kylin, 1956 accepted as Vertebrata fruticulosa (Wulfen) Kuntze, 1891
373. Species Polysiphonia compacta A.H.S.Lucas, 1913 accepted as Polysiphonia isogona Harvey, 1855
374. Species Polysiphonia complanata (Clemente) J.Agardh, 1863 accepted as Pterosiphonia complanata (Clemente) Falkenberg, 1897
375. Species Polysiphonia concinna Hollenberg, 1944 accepted as Melanothamnus concinnus (Hollenberg) Díaz-Tapia & Maggs, 2017 (synonym)
376. Species Polysiphonia condensata Kützing, 1863 accepted as Polysiphonia opaca (C.Agardh) Moris & De Notaris, 1839
377. Species Polysiphonia confusa Hollenberg, 1961 accepted as Eutrichosiphonia confusa (Hollenberg) Savoie & G.W.Saunders, 2019
378. Species Polysiphonia constricta Womersley, 1979 accepted as Vertebrata constricta (Womersley) Díaz-Tapia & Maggs, 2017
379. Species Polysiphonia corymbifera (C.Agardh) Endlicher, 1843 accepted as Streblocladia corymbifera (C.Agardh) Kylin, 1938
380. Species Polysiphonia cristata Harvey, 1836 accepted as Pterosiphonia complanata (Clemente) Falkenberg, 1897
381. Species Polysiphonia cuspidata J.Agardh, 1852 accepted as Bryocladia cuspidata (J.Agardh) De Toni, 1903
382. Species Polysiphonia cymosa Kützing, 1849 accepted as Boergeseniella fruticulosa (Wulfen) Kylin, 1956 accepted as Vertebrata fruticulosa (Wulfen) Kuntze, 1891
383. Species Polysiphonia cystophyllicola Noda, 1975 accepted as Neosiphonia yendoi (Segi) M.S.Kim & I.K.Lee, 1999 accepted as Melanothamnus yendoi (T.Segi) Díaz-Tapia & Maggs, 2017
384. Species Polysiphonia dasyoides Zanardini, 1874 accepted as Echinothamnion hookeri (Harvey) Kylin ex P.C.Silva, 1996
385. Species Polysiphonia daviesii J.D.Hooker & Harvey, 1845 accepted as Heterosiphonia berkeleyi Montagne, 1842
386. Species Polysiphonia decumbens Segi, 1951 accepted as Melanothamnus decumbens (T.Segi) Díaz-Tapia & Maggs, 2017
387. Species Polysiphonia delphina De Notaris, 1846 accepted as Carradoriella elongata (Hudson) Savoie & G.W.Saunders, 2019
388. Species Polysiphonia deludens Falkenberg, 1901 accepted as Boergeseniella deludens (Falkenberg) Kylin, 1956
389. Species Polysiphonia dendritica (C.Agardh) J.Agardh, 1863 accepted as Dipterosiphonia dendritica (C.Agardh) F.Schmitz, 1897
390. Species Polysiphonia dendroidea Montagne, 1837 accepted as Symphyocladiella dendroidea (Montagne) D.Bustamante, B.Y.Won, S.C.Lindstrom & T.O.Cho, 2019
391. Species Polysiphonia denudata (Dillwyn) Greville ex Harvey, 1833 accepted as Carradoriella denudata (Dillwyn) Savoie & G.W.Saunders, 2019
392. Species Polysiphonia deusta Kützing accepted as Polysiphonia sanguinea (C.Agardh) Zanardini, 1840
393. Species Polysiphonia deusta (Roth) J.Agardh, 1842 accepted as Polysiphonia deusta (Roth) Sprengel, 1827
394. Species Polysiphonia dichotoma Hollenberg, 1944 accepted as Polysiphonia indigena Hollenberg, 1958 (synonym)
395. Species Polysiphonia dictyurus J.Agardh, 1847 (unaccepted)
396. Species Polysiphonia dilatata Kützing (unaccepted)
397. Species Polysiphonia disticha Zanardini, 1847 (unaccepted)
398. Species Polysiphonia divaricata (C.Agardh) Sprengel, 1827 (unaccepted)
399. Species Polysiphonia doubletiae Sauvageau, 1925 (unaccepted)
400. Species Polysiphonia dysanophora Kützing, 1843 (unaccepted)
401. Species Polysiphonia eastwoodiae Setchell & N.L.Gardner, 1930 (unaccepted)
402. Species Polysiphonia echinata Harvey, 1853 (unaccepted)
403. Species Polysiphonia elongata (Hudson) Sprengel, 1827 (unaccepted)
404. Species Polysiphonia elongella Harvey, 1833 (unaccepted)
405. Species Polysiphonia ericoides Harvey, 1847 (unaccepted)
406. Species Polysiphonia erythrocoma Kützing, 1843 (unaccepted)
407. Species Polysiphonia expansa (C.Agardh) Endlichter, 1843 (unaccepted)
408. Species Polysiphonia falcata Kützing, 1863 (unaccepted)
409. Species Polysiphonia fasciculata Kützing, 1843 (unaccepted)
410. Species Polysiphonia fastigiata (Roth) Greville, 1824 (unaccepted, synonym)
411. Species Polysiphonia ferulacea Suhr ex J.Agardh, 1863 (unaccepted, synonym)
412. Species Polysiphonia ferulaceae Suhr. Ex J. Ag. (unaccepted, misspelling)
413. Species Polysiphonia fibrata (Dillwyn) Harvey, 1833 (unaccepted)
414. Species Polysiphonia fibrillosa (Dillwyn) J.Agardh, 1842 (unaccepted)
415. Species Polysiphonia fibrillosa (C.Agardh) Sprengel, 1827 (unaccepted)
416. Species Polysiphonia filamentosa (Wulfen) Sprengel, 1827 (unaccepted, synonym)
417. Species Polysiphonia filipendula Harvey ex J.Agardh, 1863 (unaccepted)
418. Species Polysiphonia flaccidissima Hollenberg, 1942 (unaccepted, synonym)
419. Species Polysiphonia flavescens Zanardini, 1874 (unaccepted)
420. Species Polysiphonia foetidissima Cocks ex Bornet, 1892 (unaccepted, synonym)
421. Species Polysiphonia forcipata Harvey, 1855 (unaccepted)
422. Species Polysiphonia forcipata J.Agardh, 1842 (unaccepted)
423. Species Polysiphonia formosa Suhr, 1831 (unaccepted, synonym)
424. Species Polysiphonia fracta Harvey, 1853 (unaccepted, synonym)
425. Species Polysiphonia fragilis Sperk [Shperk], 1869 (unaccepted, synonym)
426. Species Polysiphonia frutex Harvey, 1844 (unaccepted)
427. Species Polysiphonia fruticulosa (Wulfen) Sprengel, 1827 (unaccepted, synonym)
428. Species Polysiphonia fucoides (Hudson) Greville, 1824 (unaccepted, synonym)
429. Species Polysiphonia fuliginosa Rudolphi, 1831 (unaccepted)
430. Species Polysiphonia furcellata (C.Agardh) Harvey, 1833 (unaccepted, synonym)
431. Species Polysiphonia fuscescens Harvey, 1844 (unaccepted)
432. Species Polysiphonia gardneri Kylin, 1941 (unaccepted, synonym)
433. Species Polysiphonia glomerulata (C.Agardh) Sprengel, 1827 (unaccepted)
434. Species Polysiphonia gopnathensis Thivy & Sreenivasa Rao, 1963 (unaccepted)
435. Species Polysiphonia gorgoniae Harvey, 1853 (unaccepted)
436. Species Polysiphonia grateloupeoides Noda, 1970 (unaccepted)
437. Species Polysiphonia grevillei Harvey, 1841 (unaccepted)
438. Species Polysiphonia griffithsiana Harvey, 1841 (unaccepted)
439. Species Polysiphonia grisea Kützing, 1843 (unaccepted)
440. Species Polysiphonia gunniana Harvey, 1844 (unaccepted)
441. Species Polysiphonia haematites Kützing, 1843 (unaccepted, synonym)
442. Species Polysiphonia hakodatensis Yendo, 1920 (unaccepted)
443. Species Polysiphonia hancockii E.Y.Dawson, 1944 (unaccepted)
444. Species Polysiphonia harlandii Harvey, 1860 (unaccepted)
445. Species Polysiphonia harveyi Bailey, 1848 (unaccepted)
446. Species Polysiphonia hawaiiensis Hollenberg, 1968 (unaccepted, synonym)
447. Species Polysiphonia hemispaerica Areschoug, 1875 (unaccepted, misspelling)
448. Species Polysiphonia hendryi N.L.Gardner, 1927 (unaccepted)
449. Species Polysiphonia heringii Harvey, 1847 (unaccepted)
450. Species Polysiphonia heteroclada J.Agardh, 1885 (unaccepted)
451. Species Polysiphonia hillebrandii Bornet, 1883 (unaccepted)
452. Species Polysiphonia hookeri Harvey, 1847 (unaccepted)
453. Species Polysiphonia howei Hollenberg, 1945 (unaccepted)
454. Species Polysiphonia humilis Kützing, 1849 (unaccepted)
455. Species Polysiphonia hypnoides Welwitsch ex J.Agardh, 1863 (unaccepted)
456. Species Polysiphonia hystrix Hooker f. & Harvey, 1847 (unaccepted)
457. Species Polysiphonia impolita Zanardini (unaccepted)
458. Species Polysiphonia incompta Harvey, 1847 (unaccepted)
459. Species Polysiphonia inconspicua Reinsch, 1888 (unaccepted)
460. Species Polysiphonia inconspicua Hollenberg, 1944 (unaccepted)
461. Species Polysiphonia incurva Zanardini (unaccepted)
462. Species Polysiphonia inflata G.Martens, 1866 (unaccepted)
463. Species Polysiphonia insidiosa Greville ex J.Agardh, 1863 (unaccepted)
464. Species Polysiphonia insidiosa (J.Agardh) P.Crouan & H.Crouan, 1867 (unaccepted, synonym)
465. Species Polysiphonia intricata (C.Agardh) J.Agardh, 1842 (unaccepted, synonym)
466. Species Polysiphonia inversa Sonder, 1845 (unaccepted)
467. Species Polysiphonia japonica Harvey, 1857 (unaccepted)
468. Species Polysiphonia javanica G.Martens, 1866 (unaccepted)
469. Species Polysiphonia johnstonii Setchell & Gardner, 1924 (unaccepted)
470. Species Polysiphonia kellneri Zanardini (unaccepted)
471. Species Polysiphonia laevigata Kützing, 1843 (unaccepted)
472. Species Polysiphonia lanosa (Linnaeus) Tandy, 1931 (unaccepted)
473. Species Polysiphonia latiovalis Noda, 1975 (unaccepted)
474. Species Polysiphonia lawrenciana Harvey, 1844 (unaccepted)
475. Species Polysiphonia laxa Kützing, 1843 (unaccepted)
476. Species Polysiphonia laxa Harvey, 1859 (unaccepted)
477. Species Polysiphonia laxiuscula Meneghini, 1849 (unaccepted)
478. Species Polysiphonia lepadicola (Lyngbye) Sprengel, 1827 (unaccepted, synonym)
479. Species Polysiphonia leptoclonia Zanardini ex A.De Toni, 1907 (unaccepted)
480. Species Polysiphonia leptura Kützing, 1843 (unaccepted)
481. Species Polysiphonia lithophila Kützing (unaccepted, synonym)
482. Species Polysiphonia lobophoralis Mamoozadeh & Freshwater, 2012 (unaccepted)
483. Species Polysiphonia longiarticulata Zanardini (unaccepted)
484. Species Polysiphonia longissima J.Agardh, 1896 (unaccepted)
485. Species Polysiphonia lophoclados (Montagne) Kützing, 1847 (unaccepted)
486. Species Polysiphonia lutensis Zanardini (unaccepted)
487. Species Polysiphonia lyallii J.D.Hooker & Harvey, 1845 (unaccepted)
488. Species Polysiphonia lyngbyei Kützing, 1843 (unaccepted)
489. Species Polysiphonia macrarthra Zanardini, 1874 (unaccepted)
490. Species Polysiphonia macrocarpa Harvey, 1836 (unaccepted, synonym)
491. Species Polysiphonia macrocephala Zanardini, 1864 (unaccepted)
492. Species Polysiphonia macroclonia Kützing, 1843 (unaccepted)
493. Species Polysiphonia mallardiae (Harvey) Harvey, 1847 (unaccepted)
494. Species Polysiphonia martensiana Kützing, 1843 (unaccepted)
495. Species Polysiphonia masonii Setchell & N.L.Gardner, 1930 (unaccepted)
496. Species Polysiphonia megarthra Zanardini ex De Toni, 1907 (unaccepted)
497. Species Polysiphonia melagonium Meneghini, 1844 (unaccepted)
498. Species Polysiphonia melanochroa Kützing, 1849 (unaccepted)
499. Species Polysiphonia micracantha Zanardini ex A.De Toni, 1907 (unaccepted)
500. Species Polysiphonia microcarpa J.D.Hooker & Harvey, 1845 (unaccepted)
501. Species Polysiphonia microdendron J.Agardh, 1841 (unaccepted, synonym)
502. Species Polysiphonia miniata (C.Agardh) Kützing, 1849 (unaccepted)
503. Species Polysiphonia minutissima Hollenberg, 1942 (unaccepted)
504. Species Polysiphonia moestingi (Lyngbye) Sprengel, 1827 (unaccepted)
505. Species Polysiphonia moestingii (Lyngbye) Sprengel, 1827 (unaccepted)
506. Species Polysiphonia monilifera Hooker f. & Harvey, 1847 (unaccepted)
507. Species Polysiphonia monocarpa Montagne, 1842 (unaccepted)
508. Species Polysiphonia montagnei De Notaris, 1841 (unaccepted)
509. Species Polysiphonia moritziana Sonder ex Kützing, 1849 (unaccepted)
510. Species Polysiphonia morroides B.Kim & M.S.Kim, 2014 (unaccepted)
511. Species Polysiphonia muelleriana J.Agardh, 1870 (unaccepted)
512. Species Polysiphonia multicapsularis Zanardini (unaccepted)
513. Species Polysiphonia mutabilis Harvey, 1855 (unaccepted)
514. Species Polysiphonia myriococca Montagne, 1841 (unaccepted, synonym)
515. Species Polysiphonia nana Kützing, 1849 (unaccepted)
516. Species Polysiphonia neglecta Harvey ex J.Agardh, 1863 (unaccepted)
517. Species Polysiphonia nigra (Hudson) Batters, 1902 (unaccepted, synonym)
518. Species Polysiphonia nigrescens (Hudson) Greville ex Harvey, 1833 (unaccepted, synonym)
519. Species Polysiphonia nigrita Sonder, 1845 (unaccepted)
520. Species Polysiphonia nipponica Segi, 1951 (unaccepted)
521. Species Polysiphonia notoensis Segi, 1951 (unaccepted)
522. Species Polysiphonia nova-angliae W.R.Taylor (unaccepted)
523. Species Polysiphonia novae-angliae W.R.Taylor, 1937 (unaccepted)
524. Species Polysiphonia nuda Mamoozadeh & Freshwater, 2012 (unaccepted)
525. Species Polysiphonia nutans Montagne, 1841 (unaccepted, synonym)
526. Species Polysiphonia obscura (C.Agardh) J.Agardh, 1842 (unaccepted, synonym)
527. Species Polysiphonia obscura Harvey, 1855 (unaccepted)
528. Species Polysiphonia obsoleta Segi, 1951 (unaccepted)
529. Species Polysiphonia ohmaensis Ohta, 1973 (unaccepted)
530. Species Polysiphonia olneyi Harvey, 1851 (unaccepted, synonym)
531. Species Polysiphonia ophiocarpa Kützing, 1843 (unaccepted)
532. Species Polysiphonia paniculata Montagne, 1842 (unaccepted > superseded combination)
533. Species Polysiphonia parasitica (Hudson) Greville, 1824 (unaccepted)
534. Species Polysiphonia parvula Zanardini, 1847 (unaccepted)
535. Species Polysiphonia patens (Dillwyn) Harvey, 1833 (unaccepted)
536. Species Polysiphonia patersonis Sonder, 1855 (unaccepted)
537. Species Polysiphonia pauperula Kützing, 1863 (unaccepted)
538. Species Polysiphonia pecten J.E.Areschoug, 1854 (unaccepted)
539. Species Polysiphonia pecten-veneris Harvey, 1853 (unaccepted)
540. Species Polysiphonia pectinata J.D.Hooker & Harvey, 1845 (unaccepted)
541. Species Polysiphonia pectinata Harvey ex Kützing, 1864 (unaccepted, synonym)
542. Species Polysiphonia pectinella Harvey, 1855 (unaccepted)
543. Species Polysiphonia penicillata (C.Agardh) Sprengel, 1827 (unaccepted)
544. Species Polysiphonia pennata (C.Agardh) J.Agardh, 1842 (unaccepted)
545. Species Polysiphonia pentamera Hollenberg, 1968 (unaccepted)
546. Species Polysiphonia perpusilla J.Agardh, 1847 (unaccepted)
547. Species Polysiphonia perreymondii J.Agardh, 1842 (unaccepted, synonym)
548. Species Polysiphonia phleborhiza Kützing, 1849 (unaccepted)
549. Species Polysiphonia physartra Kützing, 1849 (unaccepted)
550. Species Polysiphonia piligera Zanardini ex De Toni, 1907 (unaccepted)
551. Species Polysiphonia pinnulata Kützing, 1843 (unaccepted)
552. Species Polysiphonia platycarpa Børgesen, 1934 (unaccepted)
553. Species Polysiphonia plumula J.Agardh, 1885 (unaccepted)
554. Species Polysiphonia polymorpha (Linnaeus) Duby, 1830 (unaccepted, synonym)
555. Species Polysiphonia polymorpha Montagne, 1843 (unaccepted, synonym)
556. Species Polysiphonia polyphora Kützing, 1849 (unaccepted)
557. Species Polysiphonia polyphysa Kützing, 1863 (unaccepted)
558. Species Polysiphonia porrecta T.Segi, 1951 (unaccepted, synonym)
559. Species Polysiphonia prorepens Harvey, 1847 (unaccepted)
560. Species Polysiphonia prostrata Harvey, 1855 (unaccepted)
561. Species Polysiphonia pseudovillum Hollenberg, 1968 (unaccepted)
562. Species Polysiphonia pulvinata Liebmann, 1845 (unaccepted)
563. Species Polysiphonia pungens Hollenberg, 1942 (unaccepted)
564. Species Polysiphonia punicea Montagne, 1842 (unaccepted)
565. Species Polysiphonia purpurata Zanardini ex De Toni, 1907 (unaccepted)
566. Species Polysiphonia purpurea (C.Agardh) J.Agardh, 1842 (unaccepted, synonym)
567. Species Polysiphonia purpurea Postels & Ruprecht, 1840 (unaccepted, synonym)
568. Species Polysiphonia pycnocoma Kützing, 1849 (unaccepted)
569. Species Polysiphonia pycnophloea Kützing, 1849 (unaccepted)
570. Species Polysiphonia ramellosa Kützing, 1843 (unaccepted)
571. Species Polysiphonia ramulosa (C.Agardh) Sprengel, 1827 (unaccepted)
572. Species Polysiphonia repens Kützing, 1843 (unaccepted)
573. Species Polysiphonia reptabunda (Suhr) Kützing, 1843 (unaccepted)
574. Species Polysiphonia rhizoidea Meñez, 1964 (unaccepted, synonym)
575. Species Polysiphonia rhododactyla Harvey, 1855 (unaccepted)
576. Species Polysiphonia rhodomeloides Kützing, 1847 (unaccepted)
577. Species Polysiphonia richardsonii W.J.Hooker ex Harvey, 1833 (unaccepted, synonym)
578. Species Polysiphonia robusta Kützing, 1843 (unaccepted)
579. Species Polysiphonia robusta N.L.Gardner, 1927 (unaccepted)
580. Species Polysiphonia roeana Harvey, 1855 (unaccepted)
581. Species Polysiphonia rosea Greville, 1824 (unaccepted)
582. Species Polysiphonia roseola (C.Agardh) Fries, 1835 (unaccepted)
583. Species Polysiphonia rostrata Sonder, 1845 (unaccepted)
584. Species Polysiphonia ruchingeri (C.Agardh) Zanardini, 1841 (unaccepted, synonym)
585. Species Polysiphonia rufolanosa Harvey, 1855 (unaccepted, synonym)
586. Species Polysiphonia rytiphlaeoides J.D.Hooker & Harvey, 1845 (unaccepted)
587. Species Polysiphonia sabulosa B.Kim & M.S.Kim, 2014 (unaccepted)
588. Species Polysiphonia sanguinea (C.Agardh) J.Agardh, 1842 (unaccepted)
589. Species Polysiphonia savatieri Hariot, 1891 (unaccepted, synonym)
590. Species Polysiphonia schneideri B.Stuercke & D.W.Freshwater, 2010 (unaccepted)
591. Species Polysiphonia schousboei Thuret, 1876 (unaccepted)
592. Species Polysiphonia schuebeleri Foslie, 1881 (unaccepted)
593. Species Polysiphonia scoparia Kützing, 1843 (unaccepted)
594. Species Polysiphonia secunda (C.Agardh) Zanardini, 1840 (unaccepted)
595. Species Polysiphonia senticosa Suhr ex Kützing, 1849 (unaccepted)
596. Species Polysiphonia sericea Hauck, 1877 (unaccepted)
597. Species Polysiphonia setacea Hollenberg, 1968 (unaccepted, synonym)
598. Species Polysiphonia simplex Hollenberg, 1942 (unaccepted, synonym)
599. Species Polysiphonia simpliciuscula P.Crouan & H.Crouan, 1852 (unaccepted, synonym)
600. Species Polysiphonia simulans Harvey, 1849 (unaccepted, synonym)
601. Species Polysiphonia siretokensis Yamada & Tanaka, 1944 (unaccepted)
602. Species Polysiphonia snyderae Kylin, 1941 (unaccepted)
603. Species Polysiphonia solierii J.Agardh, 1842 (unaccepted)
604. Species Polysiphonia sparsa (Setchell) Hollenberg, 1968 (unaccepted)
605. Species Polysiphonia sphaerocarpa Børgesen, 1918 (unaccepted, synonym)
606. Species Polysiphonia spiculifera Zanardini ex Kützing, 1864 (unaccepted)
607. Species Polysiphonia spinifera Kützing, 1843 (unaccepted)
608. Species Polysiphonia spinosissima Harvey, 1859 (unaccepted)
609. Species Polysiphonia spinuligera Zanardini, 1874 (unaccepted)
610. Species Polysiphonia spinulosa Greville, 1823 (unaccepted, synonym)
611. Species Polysiphonia spiralis L.Batten, 1923 (unaccepted, synonym)
612. Species Polysiphonia squarrosa Kützing, 1849 (unaccepted)
613. Species Polysiphonia stangeri J.Agardh, 1863 (unaccepted)
614. Species Polysiphonia stenocarpa Kützing, 1849 (unaccepted)
615. Species Polysiphonia stichidiosa Funk, 1955 (unaccepted)
616. Species Polysiphonia stimpsonii Harvey, 1859 (unaccepted)
617. Species Polysiphonia strictissima J.D.Hooker & Harvey, 1845 (unaccepted)
618. Species Polysiphonia strictoides (Lyngbye) Kützing (unaccepted)
619. Species Polysiphonia subadunca Kützing, 1843 (unaccepted)
620. Species Polysiphonia subcontinua (C.Agardh) J.Agardh, 1842 (unaccepted, synonym)
621. Species Polysiphonia subtilis Kützing, 1843 (unaccepted, synonym)
622. Species Polysiphonia subulifera (C.Agardh) Harvey, 1834 (unaccepted)
623. Species Polysiphonia sulivanae J.D.Hooker & Harvey, 1847 (unaccepted)
624. Species Polysiphonia tasmanica (Sonder) J.Agardh, 1863 (unaccepted)
625. Species Polysiphonia taylorii Hollenberg ex Williams, 1949 (unaccepted, synonym)
626. Species Polysiphonia teges Womersley, 1979 (unaccepted)
627. Species Polysiphonia tenebrosa Harvey, 1847 (unaccepted)
628. Species Polysiphonia tenella (C.Agardh) Moris & De Notaris, 1839 (unaccepted, synonym)
629. Species Polysiphonia tenuis Hollenberg, 1968 (unaccepted)
630. Species Polysiphonia tenuis (C.Agardh) E.M.Fries, 1836 (unaccepted, synonym)
631. Species Polysiphonia tepida Hollenberg, 1958 (unaccepted, synonym)
632. Species Polysiphonia teradomariensis M.Noda, 1971 (unaccepted)
633. Species Polysiphonia thuyoides Harvey, 1836 (unaccepted)
634. Species Polysiphonia thwaitesii Harvey ex J.Agardh, 1863 (unaccepted)
635. Species Polysiphonia thyrsigera J.Agardh, 1847 (unaccepted)
636. Species Polysiphonia tongatensis Harvey ex Kützing, 1864 (unaccepted)
637. Species Polysiphonia trichodes Kützing, 1843 (unaccepted, synonym)
638. Species Polysiphonia tripinnata J.Agardh, 1842 (unaccepted)
639. Species Polysiphonia umbellifera Kützing, 1843 (unaccepted)
640. Species Polysiphonia upolensis Grunow, 1874 (unaccepted, synonym)
641. Species Polysiphonia urbana Harvey, 1847 (unaccepted)
642. Species Polysiphonia urceolata (Lightfoot ex Dillwyn) Greville, 1824 (unaccepted, synonym)
643. Species Polysiphonia vagabunda Harvey, 1859 (unaccepted, synonym)
644. Species Polysiphonia valida J.Agardh, 1896 (unaccepted)
645. Species Polysiphonia variegata (C.Agardh) Zanardin, 1840 (unaccepted)
646. Species Polysiphonia versicolor Hooker f. & Harvey, 1847 (unaccepted)
647. Species Polysiphonia verticillata Harvey, 1833 (unaccepted)
648. Species Polysiphonia vestita J.Agardh, 1842 (unaccepted, synonym)
649. Species Polysiphonia victoriae (Harvey) Kützing, 1864 (unaccepted)
650. Species Polysiphonia vidovichii Meneghini ex Kützing, 1845 (unaccepted, synonym)
651. Species Polysiphonia violacea (Roth) Sprengel, 1827 (unaccepted, synonym)
652. Species Polysiphonia virgata (C.Agardh) Sprengel, 1827 (unaccepted)
653. Species Polysiphonia woodii Harvey, 1853 (unaccepted)
654. Species Polysiphonia wulfenii (Roth) J.Agardh, 1842 (unaccepted)
655. Species Polysiphonia yendoi T.Segi, 1951 (unaccepted)
656. Species Polysiphonia yonakuniensis Segi, 1951 (unaccepted, synonym)
657. Species Polysiphonia zostericola Lucas, 1919 (unaccepted)
658. Species Polysiphonia adriatica Schiffner, 1931 (uncertain)
659. Species Polysiphonia adscendens Meneghini, 1844 (uncertain)
660. Species Polysiphonia adscendens (Bonnemaison) P.Crouan & H.Crouan (uncertain)
661. Species Polysiphonia americana Reinsch (uncertain)
662. Species Polysiphonia amethystea Kützing (uncertain)
663. Species Polysiphonia arenaria Postels & Ruprecht (uncertain)
664. Species Polysiphonia aspera Zanardini ex A.De Toni, 1907 (uncertain)
665. Species Polysiphonia attenuata Zanardini ex A.De Toni, 1907 (uncertain)
666. Species Polysiphonia bellula De Notaris (uncertain)
667. Species Polysiphonia bicornis Sonder, 1880 (uncertain)
668. Species Polysiphonia brachygona Harvey, 1855 (uncertain)
669. Species Polysiphonia calliptera Kützing (uncertain)
670. Species Polysiphonia callitricha Kützing (uncertain)
671. Species Polysiphonia capillata De Notaris (uncertain)
672. Species Polysiphonia chlamydopteris Zanardini (uncertain)
673. Species Polysiphonia chlamydopteris Meneghini ex A.De Toni, 1907 (uncertain)
674. Species Polysiphonia codiicola Zanardini (uncertain)
675. Species Polysiphonia dasiiformis Zanardini, 1843 (uncertain)
676. Species Polysiphonia davisii J.D.Hooker & Harvey (uncertain)
677. Species Polysiphonia dichocephala Kützing (uncertain)
678. Species Polysiphonia dichotoma Zanardini ex A.De Toni, 1907 (uncertain, uncertain taxonomic status subjected to verification)
679. Species Polysiphonia diffusa (Hudson) Jones & Kingston (uncertain)
680. Species Polysiphonia discolor (Agardh) Sprengel (uncertain)
681. Species Polysiphonia episcopalis Zanardini ex A.De Toni, 1907 (uncertain)
682. Species Polysiphonia expansa Zanardini, 1864 (uncertain, uncertain taxonomic status subjected to verification)
683. Species Polysiphonia floccosa Zanardini, 1843 (uncertain)
684. Species Polysiphonia furcata Meneghini ex A.De Toni, 1907 (uncertain)
685. Species Polysiphonia gibbesii Harvey (uncertain)
686. Species Polysiphonia guadalupens Setchell & Gardner (uncertain)
687. Species Polysiphonia guernisaci (P.L.Crouan & H.M.Crouan) J.Agardh (uncertain)
688. Species Polysiphonia hamulifera Kützing (uncertain)
689. Species Polysiphonia hispida Zanardini, 1864 (uncertain)
690. Species Polysiphonia incompta De Notaris, 1846 (uncertain)
691. Species Polysiphonia insignis P.L.Crouan & H.M.Crouan (uncertain)
692. Species Polysiphonia juncea Kützing (uncertain)
693. Species Polysiphonia lasiorhiza Kützing (uncertain)
694. Species Polysiphonia lasiotricha Kützing (uncertain)
695. Species Polysiphonia leptoclada (Montagne) Kützing, 1864 (uncertain)
696. Species Polysiphonia morrowii Harvey, 1857 (uncertain)
697. Species Polysiphonia mucosa P.L.Crouan & H.M.Crouan (uncertain)
698. Species Polysiphonia multifida Duby (uncertain)
699. Species Polysiphonia multifida Kützing (uncertain)
700. Species Polysiphonia nemalii Zanardini, 1843 (uncertain)
701. Species Polysiphonia pappeana Kützing (uncertain)
702. Species Polysiphonia patula Kützing (uncertain)
703. Species Polysiphonia physarthra (Kützing) Kützing (uncertain)
704. Species Polysiphonia polycephala Zanardini ex De Toni, 1907 (uncertain)
705. Species Polysiphonia pulchella De Notaris (uncertain)
706. Species Polysiphonia radicans (Meneghini) J.Agardh (uncertain)
707. Species Polysiphonia regularis Kützing (uncertain)
708. Species Polysiphonia rytiphloeoides J.D.Hooker & Harvey (uncertain)
709. Species Polysiphonia sanctipetri Collins (uncertain)
710. Species Polysiphonia secundata (Suhr) Kützing (uncertain)
711. Species Polysiphonia sentosa Kützing (uncertain)
712. Species Polysiphonia tenera Harvey (uncertain)
713. Species Polysiphonia tenuissima De Notaris (uncertain)
714. Species Polysiphonia tommasiniana Bertoloni, 1867 (uncertain, uncertain taxonomic status subjected to verification)
715. Species Polysiphonia trichoclada Kützing (uncertain)
716. Species Polysiphonia veneta Zanardini, 1847 (uncertain)
717. Species Polysiphonia violascens Kützing (uncertain)
718. Species Polysiphonia virens Kützing (uncertain)
719. Species Polysiphonia vulpina De Notaris (uncertain)
720. Species Polysiphonia yokoskensis Hariot (uncertain)

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