1. Species Antithamnion adenocladellum R.E.Norris, 1987
2. Species Antithamnion aglandum G.H.Kim & I.K.Lee, 1996
3. Species Antithamnion amamiense Itono, 1977
4. Species Antithamnion amphigeneum A.Millar, 1990
5. Species Antithamnion antillanum Børgesen, 1917
6. Species Antithamnion armatum (J.Agardh) De Toni, 1903
7. Species Antithamnion biarmatum Athanasiadis, 1996
8. Species Antithamnion callocladum Itono, 1971
9. Species Antithamnion compactum (Grunow) Schiffner, 1944
10. Species Antithamnion cristatum (Kützing) Schiffner, 1944
11. Species Antithamnion cruciatum (C.Agardh) Nägeli, 1847
12. Species Antithamnion decipiens (J.Agardh) Athanasiadis, 1996
13. Species Antithamnion defectum Kylin, 1925
14. Species Antithamnion delicatulum (Harvey) De Toni, 1903
15. Species Antithamnion dendroideum G.M.Smith & Hollenberg, 1943
16. Species Antithamnion densum (Suhr) M.Howe, 1914
17. Species Antithamnion diminuatum Wollaston, 1968
18. Species Antithamnion dispar (J.Agardh) J.Agardh
19. Species Antithamnion erucacladellum R.E.Norris, 1993
20. Species Antithamnion gracilentum (Harvey) J.Agardh, 1896
21. Species Antithamnion hannafordii (Harvey) J.Agardh, 1892
22. Species Antithamnion hanovioides (Sonder) De Toni, 1903
23. Species Antithamnion heterocladum Funk, 1955
24. Species Antithamnion hubbsii E.Y.Dawson, 1962
25. Species Antithamnion imbricatum (Schousboe ex Suhr) Nägeli
26. Species Antithamnion kylinii N.L.Gardner, 1927
27. Species Antithamnion makroklonion Athanasiadis, Garbary & Vandermeulen, 1990
28. Species Antithamnion nipponicum Yamada & Inagaki, 1935
29. Species Antithamnion okiense Kajimura, 1987
30. Species Antithamnion pectinatum (Montagne) Brauner, 1994
31. Species Antithamnion piliferum Cormaci & G.Furnari, 1987
32. Species Antithamnion pinnafolium Wollaston, 1968
33. Species Antithamnion pseudoarmatum Stegenga, 1986
34. Species Antithamnion pterocladellum R.E.Norris, 1987
35. Species Antithamnion sarniense (Lyle) Feldmann-Mazoyer
36. Species Antithamnion scrippsianum E.Y.Dawson, 1949
37. Species Antithamnion secundum Itono, 1971
38. Species Antithamnion sparsum Tokida, 1932
39. Subgenus Antithamnion subg. Antithamnion
    1. Species Antithamnion subg. Antithamnion amamiense Itono, 1977 represented as Antithamnion amamiense Itono, 1977
40. Subgenus Antithamnion subg. Pteroton
    1. Species Antithamnion subg. Pteroton adenocladellum R. Norris
    2. Species Antithamnion subg. Pteroton armatum (J. Agardh) De Toni, 1903 represented as Antithamnion armatum (J.Agardh) De Toni, 1903
    3. Species Antithamnion subg. Pteroton biarmatum Athanasiadis, 1996 represented as Antithamnion biarmatum Athanasiadis, 1996
    4. Species Antithamnion subg. Pteroton callocladum Itono, 1971 represented as Antithamnion callocladum Itono, 1971
    5. Species Antithamnion subg. Pteroton okiense Kajimura, 1987 represented as Antithamnion okiense Kajimura, 1987
    6. Species Antithamnion subg. Pteroton pinnafolium Wollaston represented as Antithamnion pinnafolium Wollaston, 1968
    7. Species Antithamnion subg. Pteroton pterocladellum R. Norris represented as Antithamnion pterocladellum R.E.Norris, 1987
41. Species Antithamnion tenuissimum (Hauck) Schiffner, 1915
42. Species Antithamnion uniramosum Athanasiadis, 1996
43. Species Antithamnion verticale (Harvey) J.Agardh, 1896
44. Species Antithamnion villosum (Kützing) Athanasiadis, 1993
45. Species Antithamnion adnatum (J.Agardh) J.Agardh, 1896 accepted as Antithamnionella adnata (J.Agardh) N.M.Adams, 1991
46. Species Antithamnion algeriense M.Verlaque & Seridi, 1991 accepted as Antithamnion amphigeneum A.Millar, 1990 (synonym)
47. Species Antithamnion alternans N.L.Gardner, 1927 accepted as Antithamnionella pacifica (Harvey) E.M.Wollaston, 1972
48. Species Antithamnion americanum (Harvey) Kjellman, 1883 accepted as Scagelia americana (Harvey) Athanasiadis, 1996
49. Species Antithamnion antarcticum Kylin, 1919 accepted as Pterothamnion antarcticum (Kylin) R.L.Moe & P.C.Silva, 1980
50. Species Antithamnion applicitum (Harvey) J.Agardh, 1892 accepted as Antithamnion pectinatum (Montagne) Brauner, 1994
51. Species Antithamnion asymmetricum N.L.Gardner, 1927 accepted as Antithamnionella pacifica (Harvey) E.M.Wollaston, 1972
52. Species Antithamnion atlanticum E.C.Oliveira, 1969 accepted as Antithamnionella atlantica (E.C.Oliveira) C.W.Schneider, 1984
53. Species Antithamnion australe (J.Agardh) De Toni, 1903 accepted as Shepleya australis (J.Agardh) E.M.Gordon, 1972
54. Species Antithamnion basisporum Tokida & Inaba, 1950 accepted as Antithamnionella basispora (Tokida & Inaba) Cormaci & G.Furnari, 1989
55. Species Antithamnion baylesianum N.L.Gardner, 1927 accepted as Hollenbergia subulata (Harvey) E.M.Wollaston, 1972 (synonym)
56. Species Antithamnion baylesiarum N.L.Gardner, 1927 accepted as Hollenbergia subulata (Harvey) E.M.Wollaston, 1972
57. Species Antithamnion boreale (Gobi) Kjellman, 1883 accepted as Scagelothamnion pusillum (Ruprecht) Athanasiadis, 1996 (synonym)
58. Species Antithamnion breviramosum E.Y.Dawson, 1949 accepted as Antithamnionella breviramosa (E.Y.Dawson) Wollaston, 1970
59. Species Antithamnion butlerae Collins, 1901 accepted as Acrothamnion butlerae (Collins) Kylin, 1956
60. Species Antithamnion cladodermum (Zanardini) Hauck, 1883 accepted as Balliella cladoderma (Zanardini) Athanasiadis, 1987 (synonym)
61. Species Antithamnion comosum (Harvey) J.Agardh, 1892 accepted as Warrenia comosa (Harvey) Harvey ex F.Schmitz & Hauptfleisch, 1897
62. Species Antithamnion confusum (J.Agardh) Laing, 1905 accepted as Pterothamnion confusum (J.Agardh) Athanasiadis, 1996
63. Species Antithamnion corallina Nägeli, 1862 accepted as Scagelia pylaisaei (Montagne) M.J.Wynne, 1985
64. Species Antithamnion corallina Kjellman, 1877 accepted as Scagelothamnion pusillum (Ruprecht) Athanasiadis, 1996
65. Species Antithamnion corallinum Kjellman, 1877 accepted as Scagelothamnion pusillum (Ruprecht) Athanasiadis, 1996
66. Species Antithamnion corticatum Tokida, 1932 accepted as Tokidaea corticata (Tokida) Yoshida, 1974
67. Species Antithamnion crispum (Ducluzeau) Thuret, 1863 accepted as Pterothamnion crispum (Ducluzeau) Nägeli, 1862
68. Species Antithamnion cristirhizophorum Tokida & Inaba, 1950 accepted as Antithamnion pectinatum (Montagne) Brauner, 1994
69. Species Antithamnion crouanioides Itono, 1971 accepted as Balliella crouanioides (Itono) Itono & Tak.Tanaka, 1973
70. Species Antithamnion densiusculum N.L.Gardner, 1927 accepted as Hollenbergia subulata (Harvey) E.M.Wollaston, 1972
71. Species Antithamnion dispar (Harvey) J.Agardh, 1892 accepted as Elisiella dispar (Harvey) Womersely, 1998 (synonym)
72. Species Antithamnion divergens (J.Agardh) J.Agardh, 1896 accepted as Antithamnion delicatulum (Harvey) De Toni, 1903 (synonym)
73. Species Antithamnion dumontii E.Y.Dawson, 1960 accepted as Wrangelia dumontii (E.Y.Dawson) I.A.Abbott, 1979
74. Species Antithamnion elegans Berthold, 1882 accepted as Antithamnionella elegans (Berthold) J.H.Price & D.M.John, 1986 (synonym)
75. Species Antithamnion eliseae R.E.Norris, 1987 accepted as Antithamnion compactum (Grunow) Schiffner, 1944
76. Species Antithamnion flaccidum (Hooker f. & Harvey) De Toni, 1903 accepted as Medeiothamnion flaccidum (J.D.Hooker & Harvey) J.F.Brauner, 1979
77. Species Antithamnion flagellatum Børgesen, 1945 accepted as Antithamnionella flagellata (Børgesen) I.A.Abbott, 1979 accepted as Antithamnionella graeffei (Grunow) Athanasiadis, 1996
78. Species Antithamnion floccosum (O.F.Müller) Kleen, 1874 accepted as Antithamnionella floccosa (O.F.Müller) Whittick, 1980 (synonym)
79. Species Antithamnion fragilissimum (Zanardini) De Toni, 1903 accepted as Antithamnion decipiens (J.Agardh) Athanasiadis, 1996
80. Species Antithamnion gardneri G.De Toni, 1936 accepted as Antithamnionella spirographidis (Schiffner) E.M.Wollaston, 1968 (synonym)
81. Species Antithamnion glanduliferum Kylin, 1925 accepted as Antithamnionella spirographidis (Schiffner) E.M.Wollaston, 1968
82. Species Antithamnion graeffei (Grunow) De Toni, 1903 accepted as Antithamnionella graeffei (Grunow) Athanasiadis, 1996
83. Species Antithamnion horizontale (Harvey) J.Agardh, 1892 accepted as Antithamnion verticale (Harvey) J.Agardh, 1896
84. Species Antithamnion interruptum (Smith) J.E.Gray, 1864 accepted as Seirospora interrupta (Smith) F.Schmitz, 1893
85. Species Antithamnion laxitaxis I.A.Abbott, 1979 accepted as Crouanophycus latiaxis (I.A.Abbott) A.Athanasiadis, 1998 (synonym)
86. Species Antithamnion leptocladum (Montagne) M.J.Wynne, 1986 accepted as Antithamnion densum (Suhr) M.Howe, 1914
87. Species Antithamnion lherminieri Nasr, 1941 accepted as Antithamnion antillanum Børgesen, 1917 (synonym)
88. Species Antithamnion lindaueri G.Feldmann, 1950 accepted as Pterothamnion confusum (J.Agardh) Athanasiadis, 1996
89. Species Antithamnion mcnabbii E.Y.Dawson, 1959 accepted as Antithamnionella mcnabbii (E.Y.Dawson) D.N.Young, 1981 accepted as Crouanophycus mcnabbii (E.Y.Dawson) Athanasiadis, 1998
90. Species Antithamnion microptilum (Grunow) De Toni, 1903 accepted as Dasyptilon microptilum (Grunow) Athanasiadis, 1996
91. Species Antithamnion miharae Tokida, 1942 accepted as Antithamnionella spirographidis (Schiffner) E.M.Wollaston, 1968
92. Species Antithamnion minutissimum Levring, 1941 accepted as Pterothamnion minutissimum (Levring) R.W.Ricker, 1987
93. Species Antithamnion mucronatum (J.Agardh) Nägeli, 1862 accepted as Macrothamnion pellucidum (Harvey) Wollaston, 1968
94. Species Antithamnion myurum (Suhr) Schiffner, 1944 accepted as Tetrathamnion myurum (Suhr) A.Athanasiadis, 1996 (synonym)
95. Species Antithamnion nematocladellum R.E.Norris, 1987 accepted as Antithamnion kylinii N.L.Gardner, 1927
96. Species Antithamnion nigrescens J.Agardh, 1894 accepted as Gymnothamnion nigrescens (J.Agardh) Athanasiadis, 1996
97. Species Antithamnion nigricans N.L.Gardner, 1927 accepted as Hollenbergia nigricans (N.L.Gardner) Wollaston, 1972
98. Species Antithamnion nodiferum (J.Agardh) J.Agardh, 1896 accepted as Pterothamnion nodiferum (J.Agardh) Athanasiadis & Kraft, 1994
99. Species Antithamnion occidentale Kylin, 1925 accepted as Scagelia americana (Harvey) Athanasiadis, 1996
100. Species Antithamnion ogdeniae I.A.Abbott, 1979 accepted as Antithamnion decipiens (J.Agardh) Athanasiadis, 1996
101. Species Antithamnion orbignianum (Montagne) De Toni, 1903 accepted as Pterothamnion orbignianum (Montagne) Nägeli, 1862
102. Species Antithamnion pacificum (Harvey) Kylin, 1925 accepted as Antithamnionella pacifica (Harvey) E.M.Wollaston, 1972
103. Species Antithamnion palmyrense E.Y.Dawson, 1959 accepted as Antithamnion lherminieri Nasr, 1941 accepted as Antithamnion antillanum Børgesen, 1917
104. Species Antithamnion percurrens E.Y.Dawson, 1957 accepted as Perikladosporon percurrens (E.Y.Dawson) Athanasiadis, 1996
105. Species Antithamnion plumula (J.Ellis) Thuret, 1863 accepted as Pterothamnion plumula (J.Ellis) Nägeli, 1855
106. Species Antithamnion preissii (Sonder) De Toni, 1903 accepted as Acrothamnion preissii (Sonder) E.M.Wollaston, 1968
107. Species Antithamnion pseudocorticatum E.Y.Dawson, 1962 accepted as Balliella pseudocorticata (E.Y.Dawson) D.N.Young, 1981
108. Species Antithamnion pteroton Bornet, 1892 accepted as Gymnothamnion pteroton (Bornet) Athanasiadis, 1996
109. Species Antithamnion ptilota (Hooker f. & Harvey) Harvey-Gibson, 1893 accepted as Dasyptilon ptilota (J.D.Hooker & Harvey) Athanasiadis, 1996
110. Species Antithamnion pulchellum N.L.Gardner, 1927 accepted as Antithamnion spirographidis Schiffner, 1916 accepted as Antithamnionella spirographidis (Schiffner) E.M.Wollaston, 1968
111. Species Antithamnion pumilum (Harvey) Nägeli, 1862 accepted as Antithamnion cruciatum (C.Agardh) Nägeli, 1847
112. Species Antithamnion pusillum (Ruprecht) Kjellman, 1877 accepted as Scagelothamnion pusillum (Ruprecht) Athanasiadis, 1996
113. Species Antithamnion pygmaeum N.L.Gardner, 1927 accepted as Antithamnion densum (Suhr) M.Howe, 1914
114. Species Antithamnion pylaisaei (Montagne) Kjellman, 1883 accepted as Scagelia pylaisaei (Montagne) M.J.Wynne, 1985
115. Species Antithamnion ramulosum (Reinsch) Kylin, 1919 accepted as Pterothamnion simile (J.D.Hooker & Harvey) Nägeli, 1862
116. Species Antithamnion sarniensis (Lyle) Feldmann-Mazoyer, 1941 accepted as Antithamnionella ternifolia (Hooker f. & Harvey) Lyle, 1922 (synonym)
117. Species Antithamnion secundatum N.L.Gardner, 1927 accepted as Antithamnion kylinii N.L.Gardner, 1927
118. Species Antithamnion setaceum N.L.Gardner, 1927 accepted as Antithamnion densum (Suhr) M.Howe, 1914
119. Species Antithamnion shimamurana Nagai, 1941 accepted as Irtugovia shimamurana (Nagai) Perestenko, 1996
120. Species Antithamnion shimamuranum Nagai, 1941 accepted as Irtugovia shimamurana (Nagai) Perestenko, 1996
121. Species Antithamnion simile (Hooker f. & Harvey) De Toni, 1903 accepted as Pterothamnion simile (J.D.Hooker & Harvey) Nägeli, 1862
122. Species Antithamnion simulans N.L.Gardner, 1927 accepted as Scagelia americana (Harvey) Athanasiadis, 1996
123. Species Antithamnion spirographidis Schiffner, 1916 accepted as Antithamnionella spirographidis (Schiffner) E.M.Wollaston, 1968 (synonym)
124. Species Antithamnion subcorticatum Itono, 1969 accepted as Balliella subcorticata Itono & Tak.Tanaka, 2018
125. Species Antithamnion sublittorale Setchell & N.L.Gardner, 1937 accepted as Antithamnionella sublittoralis (Setchell & N.L.Gardner) Athanasiadis, 1996
126. Species Antithamnion subulatum (Harvey) J.Agardh, 1892 accepted as Hollenbergia subulata (Harvey) E.M.Wollaston, 1972
127. Species Antithamnion tanakae Itono, 1971 accepted as Grallatoria tanakae (H.Itono) A.Athanasiadis, 1996
128. Species Antithamnion tenuissima N.L.Gardner, 1927 accepted as Antithamnionella spirographidis (Schiffner) E.M.Wollaston, 1968
129. Species Antithamnion tenuissimum N.L.Gardner, 1927 accepted as Antithamnionella spirographidis (Schiffner) E.M.Wollaston, 1968 (synonym)
130. Species Antithamnion terminale Inagaki, 1950 accepted as Acrothamnion preissii (Sonder) E.M.Wollaston, 1968
131. Species Antithamnion ternatum A.B.Joly & Cordeiro, 1966 accepted as Antithamnionella breviramosa (E.Y.Dawson) Wollaston, 1970
132. Species Antithamnion ternifolium (Hooker f. & Harvey) De Toni, 1903 accepted as Antithamnionella ternifolia (Hooker f. & Harvey) Lyle, 1922
133. Species Antithamnion therminierii (P. Crouan & H. Crouan) Bornet ex Nasr accepted as Antithamnion lherminieri Nasr, 1941 accepted as Antithamnion antillanum Børgesen, 1917 (misspelling)
134. Species Antithamnion thouarsii (Montagne) De Toni, 1903 accepted as Medeiothamnion lyallii (Harvey) E.M.Gordon, 1972
135. Species Antithamnion tristicum Joly & Yamaguishi, 1963 accepted as Antithamnionella graeffei (Grunow) Athanasiadis, 1996
136. Species Antithamnion uncinatum N.L.Gardner, 1927 accepted as Antithamnionella pacifica var. uncinata (N.L.Gardner) Wollaston, 1971 (synonym)
137. Species Antithamnion veleroae W.R.Taylor, 1945 accepted as Antithamnionella ternifolia (Hooker f. & Harvey) Lyle, 1922
138. Species Antithamnion verticillatum (Suhr) De Toni, 1903 (unaccepted)
139. Species Antithamnion barbatum (C.Agardh) Holmes & Batters (uncertain)
140. Species Antithamnion echigoense Noda, 1972 (uncertain)
141. Species Antithamnion hanowioides (Sonder) De Toni (uncertain)
142. Species Antithamnion miniatum Boo & Lee, 1986 (uncertain, uncertain taxonomic status subjected to verification)
143. Species Antithamnion ternirameum Hamel & Hamel-Joukov, 1931 (uncertain)

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