1. Forma Ceramium rubrum f. barbatum (Ardissone) Hauck
2. Forma Ceramium rubrum f. corymbiferum J.Agardh, 1876
3. Forma Ceramium rubrum f. pedicellatum J.Agardh
4. Variety Ceramium rubrum var. corymbiferum (Bonnemaison) J.Agardh, 1851
5. Variety Ceramium rubrum var. implexo-contortum (Solier) Feldmann-Mazoyer
6. Variety Ceramium rubrum var. pedicellatum J.Agardh, 1912
7. Variety Ceramium rubrum var. pedicellatum (De Candolle) Duby, 1830
8. Variety Ceramium rubrum var. pedicellatum Shperk, 1869
9. Variety Ceramium rubrum var. proliferum Hariot, 1889
10. Forma Ceramium rubrum f. barbatum (Ardissone) Hauck, 1882 (uncertain)
11. Forma Ceramium rubrum f. diaphanum Gobi (uncertain)
12. Forma Ceramium rubrum f. fasciculatum J.Agardh (uncertain)
13. Forma Ceramium rubrum f. genuinum Kjellman (uncertain)
14. Forma Ceramium rubrum f. irregulare H.E.Petersen (uncertain)
15. Forma Ceramium rubrum f. lineare H.E.Petersen (uncertain)
16. Forma Ceramium rubrum f. lineatum H.E.Petersen (uncertain)
17. Forma Ceramium rubrum f. secundatum (Lyngbye) H.E.Petersen (uncertain)
18. Forma Ceramium rubrum f. subcorticatum H.E.Petersen (uncertain)
19. Forma Ceramium rubrum f. typicum H.E.Petersen (uncertain)
20. Forma Ceramium rubrum f. typicum Reinke (uncertain)
21. Subspecies Ceramium rubrum subsp. proliferum (Lyngbye) J.Agardh (uncertain)
22. Subspecies Ceramium rubrum subsp. secundatum (Lyngbye) J.Agardh (uncertain)
23. Subspecies Ceramium rubrum subsp. tenue (C.Agardh) Ardissone (uncertain)
24. Variety Ceramium rubrum var. ambiguum Schiffner (uncertain)
25. Variety Ceramium rubrum var. barbatum Ardissone, 1871 (uncertain, uncertain taxonomic status subjected to verification)
26. Variety Ceramium rubrum var. barbatum Feldmann-Mazoyer, 1941 (uncertain)
27. Variety Ceramium rubrum var. corymbiferum Hariot (uncertain)
28. Variety Ceramium rubrum var. decurrens (Kützing) J.Agardh (uncertain)
29. Variety Ceramium rubrum var. diaphanum P.L.Crouan & H.M.Crouan (uncertain)
30. Variety Ceramium rubrum var. divaricatum C.Agardh (uncertain)
31. Variety Ceramium rubrum var. fastigiatum Wollny (uncertain)
32. Variety Ceramium rubrum var. firmum C.Agardh (uncertain)
33. Variety Ceramium rubrum var. fruticulosum Kützing (uncertain, uncertain taxonomic status subjected to verification)
34. Variety Ceramium rubrum var. maculatum S.F.Gray (uncertain)
35. Variety Ceramium rubrum var. majus C.Agardh (uncertain)
36. Variety Ceramium rubrum var. membranaceum C.Agardh (uncertain)
37. Variety Ceramium rubrum var. nodulosum Montagne, 1845 (uncertain)
38. Variety Ceramium rubrum var. ramellosum Ardissone (uncertain)
39. Variety Ceramium rubrum var. repens (Zanardini) Zanardini (uncertain)
40. Variety Ceramium rubrum var. tenue Kützing (uncertain)
41. Variety Ceramium rubrum var. virgatum C.Agardh, 1824 (uncertain)
42. Forma Ceramium rubrum f. balticum Petersen, 1908 accepted as Ceramium virgatum Roth, 1797
43. Forma Ceramium rubrum f. decurrens (J.Agardh) Kjellman, 1880 accepted as Ceramium rosenvingei Petersen, 1908
44. Forma Ceramium rubrum f. decurrentoides Petersen, 1908 accepted as Ceramium abyssale Petersen, 1924
45. Forma Ceramium rubrum f. dehiscens Petersen, 1926 accepted as Ceramium rubrum f. corymbiferum J.Agardh, 1876
46. Forma Ceramium rubrum f. divaricatum Petersen, 1908 accepted as Ceramium virgatum Roth, 1797
47. Forma Ceramium rubrum f. furcatum Petersen, 1924 accepted as Ceramium furcatum (Petersen) Petersen, 1925
48. Forma Ceramium rubrum f. irregularis Petersen, 1908 accepted as Ceramium rubrum f. corymbiferum J.Agardh, 1876
49. Forma Ceramium rubrum f. irregularis-subcorticatum Petersen, 1908 accepted as Ceramium virgatum Roth, 1797
50. Forma Ceramium rubrum f. laxa Petersen, 1926 accepted as Ceramium rubrum f. corymbiferum J.Agardh, 1876
51. Forma Ceramium rubrum f. linearis Peterson, 1911 accepted as Ceramium rubrum f. corymbiferum J.Agardh, 1876
52. Forma Ceramium rubrum f. modificatum Petersen, 1908 accepted as Ceramium virgatum Roth, 1797
53. Forma Ceramium rubrum f. proliferum (Lyngbye) Foslie, 1893 accepted as Ceramium rubrum f. corymbiferum J.Agardh, 1876
54. Forma Ceramium rubrum f. proliferum (C.Agardh) Kjellman, 1883 accepted as Ceramium virgatum Roth, 1797
55. Forma Ceramium rubrum f. radians Petersen, 1908 accepted as Ceramium rubrum f. corymbiferum J.Agardh, 1876
56. Forma Ceramium rubrum f. squarrosum (Harvey) Kjellman, 1883 accepted as Ceramium rubrum f. corymbiferum J.Agardh, 1876
57. Forma Ceramium rubrum f. subtypicum Petersen, 1908 accepted as Ceramium virgatum Roth, 1797
58. Forma Ceramium rubrum f. tenue (J.Agardh) Foslie, 1893 accepted as Ceramium rubrum f. corymbiferum J.Agardh, 1876
59. Forma Ceramium rubrum f. tenue J.Agardh, 1876 accepted as Ceramium tenue (J.Agardh) J.Agardh, 1894 (synonym)
60. Forma Ceramium rubrum f. vendlicum (Petersen) Petersen, 1935 accepted as Ceramium rubrum f. corymbiferum J.Agardh, 1876
61. Forma Ceramium rubrum f. virgatum (C.Agardh) Foslie, 1893 accepted as Ceramium rubrum f. corymbiferum J.Agardh, 1876
62. Variety Ceramium rubrum var. decurrens J.Agardh, 1851 accepted as Ceramium rosenvingei Petersen, 1908
63. Variety Ceramium rubrum var. fasciculatum J.Agardh, 1876 accepted as Ceramium rubrum f. corymbiferum J.Agardh, 1876
64. Variety Ceramium rubrum var. implexocontortum Solier, 1845 accepted as Ceramium virgatum var. implexocontortum (Solier) G.Furnari, 2003
65. Variety Ceramium rubrum var. involutum (Kützing) Piccone, 1886 accepted as Ceramium involutum Kützing, 1849
66. Variety Ceramium rubrum var. liebetruthii Grunow, 1844 accepted as Ceramium virgatum Roth, 1797 (synonym)
67. Variety Ceramium rubrum var. nitens C.Agardh, 1824 accepted as Ceramium nitens (C.Agardh) J.Agardh, 1851
68. Variety Ceramium rubrum var. pacificum Collins, 1913 accepted as Ceramium pacificum (Collins) Kylin, 1925 accepted as Ceramothamnion pacificum (Collins) M.J.Wynne & C.W.Schneider, 2023
69. Variety Ceramium rubrum var. pallens C.Agardh, 1811 accepted as Ceramium virgatum Roth, 1797
70. Variety Ceramium rubrum var. proliferum Lyngbye, 1819 accepted as Ceramium rubrum f. corymbiferum J.Agardh, 1876
71. Variety Ceramium rubrum var. proliferum C.Agardh, 1824 accepted as Ceramium virgatum Roth, 1797
72. Variety Ceramium rubrum var. pygmaeum Sonder, 1848 accepted as Ceramium virgatum Roth, 1797
73. Variety Ceramium rubrum var. secundatum (Lyngbye) C.Agardh, 1824 accepted as Ceramium secundatum Lyngbye, 1819
74. Variety Ceramium rubrum var. squarrosum Harvey, 1853 accepted as Ceramium rubrum f. corymbiferum J.Agardh, 1876
75. Variety Ceramium rubrum var. tenue C.Agardh, 1824 accepted as Ceramium virgatum var. tenue (C.Agardh) G.Furnari, 2003

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