• Acanthophora aokii Okamura, 1934
• Acanthophora muscoides (Linnaeus) Bory de Saint-Vincent, 1828
• Acanthophora spicifera (M.Vahl) Børgesen, 1910
• Acrochaetium arcuatum (K.M.Drew) C.K.Tseng, 1945
• Acrochaetium attenuatum (Rosenvinge) Hamel, 1927 accepted as Colaconema attenuatum (Rosenvinge) R.Nielsen, 1994 accepted as Acrochaetium densum (K.M.Drew) Papenfuss, 1945 accepted as Acrochaetium catenulatum M.Howe, 1914
• Acrochaetium catenulatum M.Howe, 1914
• Acrochaetium delisea Aziz, 1965
• Acrochaetium densum (K.M.Drew) Papenfuss, 1945 accepted as Acrochaetium catenulatum M.Howe, 1914
• Acrochaetium globosum Børgesen, 1915
• Acrochaetium howei (Yamada) Papenfuss, 1945
• Acrochaetium humile (Rosenvinge) Børgesen, 1915
• Acrochaetium macula (Rosenvinge) Hamel, 1927
• Acrochaetium microscopicum (Nägeli ex Kützing) Nägeli, 1858
• Acrochaetium minimum Collins, 1908 accepted as Colaconema minimum (Collins) Woelkerling, 1973
• Acrochaetium netrocarpum Børgesen, 1915
• Acrochaetium pacificum Kylin, 1925
• Acrochaetium parvulum (Kylin) Hoyt, 1920
• Acrochaetium plumosum (K.M.Drew) G.M.Smith, 1944
• Acrochaetium robustum Børgesen, 1915 accepted as Colaconema robustum (Børgesen) Huisman & Woelkerling, 2018
• Acrochaetium ryukyuense (Nakamura) Papenfuss, 1945
• Acrochaetium secundatum (Lyngbye) Nägeli, 1858
• Acrochaetium tenuissimum (Collins) Papenfuss, 1945
• Acrochaetium terminale (Nakamura) Y.-P.Lee, 1987
• Acrochaetium vagum (K.M.Drew) C.-C.Jao, 1937 accepted as Acrochaetium arcuatum (K.M.Drew) C.K.Tseng, 1945
• Acrochaetium yamadae (Garbary) Y.Lee & I.K.Lee, 1988 accepted as Liagorophila endophytica Yamada, 1944
• Acrocystis nana Zanardini, 1872
• Acrosorium ciliolatum (Harvey) Kylin, 1924
• Acrosorium flabellatum Yamada, 1930
• Acrosorium polyneurum Okamura, 1936
• Acrosorium venulosum (Zanardini) Kylin, 1924
• Acrosorium yendoi Yamada, 1930
• Actinotrichia fragilis (Forsskål) Børgesen, 1932
• Agarophyton tenuistipitatum (C.F.Chang et B.-M.Xia) Gurgel, J.N.Norris & Fredericq, 2018 accepted as Gracilaria tenuistipitata C.F.Chang & B.-M.Xia, 1976
• Agarophyton vermiculophyllum (Ohmi) Gurgel, J.N.Norris et Fredericq, 2018 accepted as Gracilaria vermiculophylla (Ohmi) Papenfuss, 1967
• Aglaothamnion callophyllidicola (Yamada) Boo, I.K.Lee, Rueness & Yoshida, 1991
• Ahnfeltia fastigiata (Endlicher) Makienko, 1970
• Ahnfeltia yinggehaiensis B.-M.Xia & Y.-Q.Zhang, 2000
• Ahnfeltiopsis flabelliformis (Harvey) Masuda, 1993
• Ahnfeltiopsis guangdongensis B.-M.Xia & Y.-Q.Zhang, 2000
• Ahnfeltiopsis hainanensis B.-M.Xia & Y.-Q.Zhang, 2000
• Ahnfeltiopsis masudae B.-M.Xia & Y.-Q.Zhang, 2000
• Ahnfeltiopsis pygmaea (J.Agardh) P.C.Silva & DeCew, 1992
• Ahnfeltiopsis serenei (E.Y.Dawson) Masuda, 1993
• Amansia glomerata C.Agardh, 1822
• Amphiroa anastomosans Weber-van Bosse, 1904
• Amphiroa anceps (Lamarck) Decaisne, 1842
• Amphiroa beauvoisii J.V.Lamouroux, 1816
• Amphiroa ephedraea (Lamarck) Decaisne, 1842
• Amphiroa foliacea J.V.Lamouroux, 1824
• Amphiroa fragilissima (Linnaeus) J.V.Lamouroux, 1816
• Amphiroa maletractata Simonsen, 1992
• Amphiroa maletractata var. constricta (Heiden) Simonsen, 2000
• Amphiroa zonata Yendo, 1902 accepted as Amphiroa beauvoisii J.V.Lamouroux, 1816
• Anotrichium tenue (C.Agardh) Nägeli, 1862
• Antithamnion antillanum Børgesen, 1917
• Antithamnion cruciatum (C.Agardh) Nägeli, 1847
• Antithamnion defectum Kylin, 1925
• Antithamnion hubbsii E.Y.Dawson, 1962
• Antithamnion lherminieri Nasr, 1941 accepted as Antithamnion antillanum Børgesen, 1917
• Antithamnion nipponicum Yamada & Inagaki, 1935
• Antithamnionella elegans (Berthold) J.H.Price & D.M.John, 1986
• Antithamnionella sarniensis Lyle, 1922 accepted as Antithamnionella ternifolia (Hooker f. & Harvey) Lyle, 1922
• Antithamnionella spirographidis (Schiffner) E.M.Wollaston, 1968
• Antithamnionella ternifolia (Hooker f. & Harvey) Lyle, 1922
• Ardreanema seriospora (E.Y.Dawson) R.E.Norris, 1994
• Asparagopsis taxiformis (Delile) Trevisan de Saint-Léon, 1845
• Audouinella attenuata (Rosenvinge) Garbary, 1979 accepted as Acrochaetium attenuatum (Rosenvinge) Hamel, 1927 accepted as Colaconema attenuatum (Rosenvinge) R.Nielsen, 1994 accepted as Acrochaetium densum (K.M.Drew) Papenfuss, 1945 accepted as Acrochaetium catenulatum M.Howe, 1914
• Audouinella codicola (Børgesen) Garbary, 1979 accepted as Colaconema codicola (Børgesen) Stegenga, J.J.Bolton & R.J.Anderson, 1997
• Audouinella codii (Hamel) G.Furnari, 2000 accepted as Colaconema caespitosum (J.Agardh) Jackelman, Stegenga & J.J.Bolton, 1991
• Audouinella curviramulosa Luan, 1993
• Audouinella daviesii (Dillwyn) Woelkerling, 1971 accepted as Colaconema daviesii (Dillwyn) Stegenga, 1985
• Audouinella dictyotae (F.S.Collins) Woelkerling, 1971 accepted as Colaconema dictyotae (Collins) I.-K.Hwang & H.-S.Kim, 2011
• Audouinella emergens (Rosenvinge) P.S.Dixon, 1976 accepted as Colaconema emergens (Rosenvinge) R.Nielsen, 1994
• Audouinella globosa (Børgesen) Garbary, 1979 accepted as Acrochaetium globosum Børgesen, 1915
• Audouinella gracilis (Børgesen) Jaasund, 1977 accepted as Colaconema gracile (Børgesen) Ateweberhan & Prud'homme van Reine, 2005
• Audouinella howei (Yamada) Garbary, 1979 accepted as Acrochaetium howei (Yamada) Papenfuss, 1945
• Audouinella hypneae (Børgesen) G.Lawson & D.M.John, 1982 accepted as Colaconema hypneae (Børgesen) A.A.Santos & C.W.N.Moura, 2010
• Audouinella nakamurae (Woelkerling) Garbary, 1979 accepted as Acrochaetium delisea Aziz, 1965
• Audouinella netrocarpa (Børgesen) Garbary, 1979 accepted as Acrochaetium netrocarpum Børgesen, 1915
• Audouinella pacifica (Kylin) Garbary, 1979 accepted as Acrochaetium pacificum Kylin, 1925
• Audouinella plumosa (K.M.Drew) Garbary, 1979 accepted as Acrochaetium plumosum (K.M.Drew) G.M.Smith, 1944
• Audouinella pugettia Luan, 1993
• Audouinella robusta (Børgesen) Garbary, 1979 accepted as Acrochaetium robustum Børgesen, 1915 accepted as Colaconema robustum (Børgesen) Huisman & Woelkerling, 2018
• Audouinella ryukyuensis (Nakamura) Garbary, 1979 accepted as Acrochaetium ryukyuense (Nakamura) Papenfuss, 1945
• Audouinella secundata (Lyngbye) P.S.Dixon, 1976 accepted as Acrochaetium secundatum (Lyngbye) Nägeli, 1858
• Audouinella seriata (Børgesen) Garbary, 1979 accepted as Colaconema hypneae (Børgesen) A.A.Santos & C.W.N.Moura, 2010
• Audouinella tenuissima (Collins) Garbary, 1979 accepted as Acrochaetium tenuissimum (Collins) Papenfuss, 1945
• Audouinella thuretii (Bornet) Woelkerling, 1971 accepted as Grania efflorescens (J.Agardh) Kylin, 1944
• Bangia breviarticulata C.K.Tseng, 1948
• Bangia fuscopurpurea (Dillwyn) Lyngbye, 1819
• Bangia gloiopeltidicola Tanaka, 1950
• Bangia yamadae Tanaka, 1944
• Betaphycus gelatinus (Esper) Doty ex P.C.Silva, 1996
• Binghamia californica J.Agardh, 1899
• Bonnemaisonia hamifera Hariot, 1891
• Boreolithothamnion glaciale (Kjellman) P.W.Gabrielson, Maneveldt, Hughey & V.Peña, 2023
• Boreolithothamnion phymatodeum (Foslie) P.W.Gabrielson, Maneveldt, Hughey & V.Pena, 2023
• Bossiella cretacea (Postels & Ruprecht) H.W.Johansen, 1969 accepted as Corallina officinalis Linnaeus, 1758
• Bostrychia hongkongensis C.K.Tseng, 1943
• Bostrychia intricata (Bory) Montagne, 1852