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

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