• Andersoniella farlowii F.Schmitz (uncertain)
• Borrichius gelatinosus S.F.Gray, 1821 accepted as Dudresnaya verticillata (Withering) Le Jolis, 1863
• Constantinea grandifolia (J.J.Rodríguez y Femenías) Ardissone, 1901 accepted as Neurocaulon foliosum (Meneghini) Zanardini ex Kützing, 1849
• Constantinea reniformis (Turner) Postels & Ruprecht, 1840 accepted as Neurocaulon foliosum (Meneghini) Zanardini ex Kützing, 1849
• Constantinea rosa-marina (S.G.Gmelin) Postels & Ruprecht, 1840
• Constantinea simplex Setchell, 1901
• Constantinea sitchensis Postels & Ruprecht, 1840
• Constantinea subulifera Setchell, 1906
• Constantinea thiebautii Bornet, 1885 accepted as Neurocaulon thiebautii (Bornet) Farghaly, 1980
• Cryptosiphonia grayana (J.Agardh) J.Agardh, 1876 accepted as Cryptosiphonia woodii (J.Agardh) J.Agardh, 1876
• Cryptosiphonia woodii (J.Agardh) J.Agardh, 1876
• Dasyphloea gigartinoides Sonder, 1881 accepted as Dasyphloea insignis Montagne, 1842
• Dasyphloea insignis Montagne, 1842
• Dasyphloea tasmanica J.D.Hooker & Harvey, 1847 accepted as Dasyphloea insignis Montagne, 1842
• Dilsea californica (J.Agardh) Kuntze, 1891
• Dilsea carnosa (Schmidel) Kuntze, 1898
• Dilsea edulis Stackhouse, 1809 accepted as Dilsea carnosa (Schmidel) Kuntze, 1898
• Dilsea integra (Kjellman) Rosenvinge, 1898 accepted as Dilsea socialis (Postels & Ruprecht) Perestenko, 1996
• Dilsea lindstromiae G.W.Saunders, 2008
• Dilsea natashae (S.C.Lindstrom) G.W.Saunders & S.C.Lindstrom, 2011
• Dilsea pygmaea (Setchell) Setchell, 1901
• Dilsea socialis (Postels & Ruprecht) Perestenko, 1996
• Dudresnaya abbottiae Afonso-Carrillo & Tabares, 2004
• Dudresnaya australis J.Agardh ex Setchell, 1912
• Dudresnaya babbittiana Abbott & K.J.McDermid, 2001
• Dudresnaya bermudensis Setchell, 1912
• Dudresnaya canariensis Tabares, Afonso-Carrillo, Sansón & Reyes, 1997
• Dudresnaya canescens J.Agardh, 1899
• Dudresnaya capricornia Robins & Kraft accepted as Dudresnaya capricornica Robins & Kraft, 1985
• Dudresnaya capricornica Robins & Kraft, 1985
• Dudresnaya caribaea (J.Agardh) Setchell, 1912 accepted as Acrosymphyton caribaeum (J.Agardh) Sjöstedt, 1926
• Dudresnaya clavata (Kützing) Trevisan, 1848 accepted as Helminthora divaricata (C.Agardh) J.Agardh, 1852
• Dudresnaya coccinea (C.Agardh) P.L.Crouan & H.M.Crouan, 1835 accepted as Dudresnaya verticillata (Withering) Le Jolis, 1863
• Dudresnaya colombiana W.R.Taylor, 1945
• Dudresnaya crassa M.A.Howe, 1905
• Dudresnaya cupressina Bonnemaison
• Dudresnaya dalmatica (Kützing) Zanardini, 1865 accepted as Calosiphonia dalmatica (Kützing) Bornet & Flahault, 1883
• Dudresnaya divaricata (C.Agardh) J.Agardh, 1842 accepted as Helminthora divaricata (C.Agardh) J.Agardh, 1852
• Dudresnaya georgiana Searles, 1983
• Dudresnaya hawaiiensis R.K.S.Lee, 1963
• Dudresnaya hudsonii Harvey
• Dudresnaya japonica Okamura, 1902
• Dudresnaya kuroshioensis Kajimura, 1994
• Dudresnaya littleri I.A.Abbott, 1996
• Dudresnaya lubrica (Lyngbye) Trevisan, 1848 accepted as Gloiosiphonia capillaris (Hudson) Carmichael, 1833
• Dudresnaya lubrica M.M.Littler, 1974 accepted as Dudresnaya littleri I.A.Abbott, 1996
• Dudresnaya minima Okamura, 1932
• Dudresnaya multifida (Lyngbye) Trevisan, 1848 accepted as Nemalion multifidum (Lyngbye) Chauvin, 1842
• Dudresnaya multiramosa Afonso-Carrillo, Sansón & Reyes, 2002
• Dudresnaya nemalion (Bertoloni) Trevisan, 1848 accepted as Nemalion elminthoides (Velley) Batters, 1902
• Dudresnaya nodulosa Ercegovic, 1949 accepted as Gulsonia nodulosa (Ercegovic) Feldmann & G.Feldmann, 1967
• Dudresnaya okiensis Kajimura, 1993
• Dudresnaya patula Eiseman & J.N.Norris, 1981
• Dudresnaya puertoricensis Searles & Ballantine, 1986
• Dudresnaya purpurifera J.Agardh, 1842 accepted as Acrosymphyton purpuriferum (J.Agardh) G.Sjöstedt, 1926
• Dudresnaya ramosissima (Zanardini) Trevisan, 1848 accepted as Nemalion ramosissimum Zanardini, 1847 accepted as Helminthora divaricata (C.Agardh) J.Agardh, 1852
• Dudresnaya rubens (Hudson) Trevisan
• Dudresnaya verticillata (Withering) Le Jolis, 1863
• Dumontia alaskana V.Tai, S.C.Lindstrom & G.W.Saunders, 2001
• Dumontia calvadosii J.V.Lamouroux ex Duby, 1830 accepted as Helminthocladia calvadosii (J.V.Lamouroux ex Duby) Setchell, 1915
• Dumontia canariensis Montagne, 1841
• Dumontia clava Postels & Ruprecht, 1840
• Dumontia contorta (S.G.Gmelin) Ruprecht, 1850
• Dumontia cornuta J.D.Hooker & Harvey, 1845
• Dumontia decapitata Postels & Ruprecht, 1841 accepted as Halosaccion glandiforme (S.G.Gmelin) Ruprecht, 1850
• Dumontia dura Ruprecht, 1850 accepted as Gloiopeltis dura (Ruprecht) J.Agardh, 1876
• Dumontia fastigiata (Bory de Saint-Vincent) Bory de Saint-Vincent, 1828 accepted as Nothogenia fastigiata (Bory) P.G.Parkinson, 1983
• Dumontia fastigiata var. minor Hohenacker, 1857 accepted as Gracilaria pulvinata Skottsberg, 1923
• Dumontia filiformis (Hornemann) Greville, 1830 accepted as Dumontia contorta (S.G.Gmelin) Ruprecht, 1850
• Dumontia filiformis f. crispata (Greville) Hauck, 1883 accepted as Dumontia contorta (S.G.Gmelin) Ruprecht, 1850
• Dumontia filiformis var. crispata (Greville) Greville, 1830 accepted as Dumontia contorta (S.G.Gmelin) Ruprecht, 1850
• Dumontia firma Postels & Ruprecht, 1840 accepted as Devaleraea firma (Postels & Ruprecht) Selivanova, 2016
• Dumontia firma var. fibrillosa Postels & Ruprecht, 1840 accepted as Halosaccion firmum var. fibrillosum (Postels & Ruprecht) Ruprecht, 1850
• Dumontia fucicola Postels & Ruprecht, 1840 accepted as Halosaccion glandiforme (S.G.Gmelin) Ruprecht, 1850
• Dumontia furcata Postels & Ruprecht, 1840 accepted as Gloiopeltis furcata (Postels & Ruprecht) J.Agardh, 1851
• Dumontia furcellata (Turner) Bory, 1834 accepted as Scinaia furcellata (Turner) J.Agardh, 1851
• Dumontia humilis Schousboe (uncertain)
• Dumontia hydrophora Postels & Ruprecht, 1840 accepted as Halosaccion glandiforme (S.G.Gmelin) Ruprecht, 1850
• Dumontia incrassata (O.F.Müller) J.V.Lamouroux, 1813 accepted as Dumontia contorta (S.G.Gmelin) Ruprecht, 1850
• Dumontia incrassata var. crispata (Greville) Batters, 1902 accepted as Dumontia contorta (S.G.Gmelin) Ruprecht, 1850
• Dumontia interrupta (A.P.de Candolle) Duby, 1830 accepted as Scinaia interrupta (A.P.de Candolle) M.J.Wynne, 1989
• Dumontia lepechinii Endlicher, 1843 accepted as Devaleraea ramentacea (Linnaeus) Guiry, 1982
• Dumontia lepechinii Postels & Ruprecht, 1840 accepted as Halosaccion saccatum (Lepechin) Kützing, 1866
• Dumontia ovalis Suhr, 1840 accepted as Nothogenia ovalis (Suhr) P.G.Parkinson, 1983
• Dumontia pinnatifida Schousboe (uncertain)
• Dumontia prismatica J.Agardh, 1841 accepted as Corynomorpha prismatica (J.Agardh) J.Agardh, 1876
• Dumontia ramentacea (Linaeus) Greville, 1830 accepted as Devaleraea ramentacea (Linnaeus) Guiry, 1982
• Dumontia robusta Greville, 1830 accepted as Solieria robusta (Greville) Kylin, 1932
• Dumontia robusta var. wightii (J.Agardh) G.Martens, 1866 accepted as Solieria robusta (Greville) Kylin, 1932
• Dumontia rugosa Suhr, 1840 (uncertain)
• Dumontia saccata (Lepechin) Greville, 1830 accepted as Halosaccion saccatum (Lepechin) Kützing, 1866
• Dumontia simplex Cotton, 1906
• Dumontia sobolifera (Oeder) J.V.Lamouroux, 1813 accepted as Devaleraea ramentacea (Linnaeus) Guiry, 1982
• Dumontia triquetra J.V.Lamouroux, 1813 accepted as Scinaia interrupta (A.P.de Candolle) M.J.Wynne, 1989
• Dumontia tubulosa (Lepechin) Postels & Ruprecht, 1840 accepted as Devaleraea ramentacea (Linnaeus) Guiry, 1982
• Dumontia ventricosa J.V.Lamouroux, 1813 accepted as Chrysymenia ventricosa (J.V.Lamouroux) J.Agardh, 1842
• Farlowia compressa J.Agardh, 1876 accepted as Farlowia mollis (Harvey & Bailey) Farlow & Setchell, 1901
• Farlowia conferta (Setchell) I.A.Abbott, 1968
• Farlowia crassa J.Agardh, 1876 accepted as Farlowia mollis (Harvey & Bailey) Farlow & Setchell, 1901
• Farlowia irregularis Yamada, 1933 accepted as Masudaphycus irregularis (Yamada) S.C.Lindstrom, 1988