Acanthophora J.V.Lamouroux, 1813 (additional source)
Acanthophora spicifera (M.Vahl) Børgesen, 1910 (basis of record)
Acetabularia clavata Yamada, 1934 accepted as Parvocaulis clavatus (Yamada) S.Berger, U.Fettweiss, S.Gleissberg, L.B.Liddle, U.Richter, H.Sawitzky & G.C.Zuccarello, 2003 (basis of record)
Acetabularia parvula Solms-Laubach, 1895 accepted as Parvocaulis parvulus (Solms-Laubach) S.Berger, Fettweiss, Gleissberg, Liddle, U.Richter, Sawitzky & Zuccarello, 2003 (additional source)
Acrochaetium Nägeli, 1858 (additional source)
Acrochaetium secundatum (Lyngbye) Nägeli, 1858 (additional source)
Acrocystis Zanardini, 1872 (basis of record)
Acrocystis nana Zanardini, 1872 (basis of record)
Acrosorium Zanardini ex Kützing, 1869 (additional source)
Acrosorium venulosum (Zanardini) Kylin, 1924 (additional source)
Actinotrichia Decaisne, 1842 (basis of record)
Actinotrichia fragilis (Forsskål) Børgesen, 1932 (basis of record)
Aglaothamnion Feldmann-Mazoyer, 1941 (additional source)
Ahnfeltiopsis P.C.Silva & DeCew, 1992 (additional source)
Amansia J.V.Lamouroux, 1809 (basis of record)
Amphiroa J.V.Lamouroux, 1812 (additional source)
Amphiroa anastomosans Weber-van Bosse, 1904 (basis of record)
Amphiroa anceps (Lamarck) Decaisne, 1842 (basis of record)
Amphiroa beauvoisii J.V.Lamouroux, 1816 (additional source)
Amphiroa ephedraea (Lamarck) Decaisne, 1842 (basis of record)
Amphiroa foliacea J.V.Lamouroux, 1824 (basis of record)
Amphiroa fragilissima (Linnaeus) J.V.Lamouroux, 1816 (additional source)
Anadyomene J.V.Lamouroux, 1812 (additional source)
Anadyomene wrightii Harvey ex J.E.Gray, 1866 (basis of record)
Anotrichium Nägeli, 1862 (additional source)
Anotrichium tenue (C.Agardh) Nägeli, 1862 (additional source)
Antithamnion Nägeli, 1847 (additional source)
Antithamnion hubbsii E.Y.Dawson, 1962 (basis of record)
Aphanothece Nägeli, 1849 (additional source)
Arthrospira Sitzenberger ex Gomont, 1892 (additional source)
Arthrospira platensis Gomont, 1892 (basis of record)
Asparagopsis Montagne, 1840 (additional source)
Asparagopsis taxiformis (Delile) Trevisan de Saint-Léon, 1845 (additional source)
Asteronema Delépine & Asensi, 1975 (additional source)
Bangia Lyngbye, 1819 (additional source)
Betaphycus Doty, 1996 (original description)
Betaphycus gelatinus (Esper) Doty ex P.C.Silva, 1996 (new combination reference)
Blennothrix Kützing ex Anagnostidis & Komárek, 1988 (basis of record)
Blennothrix cantharidosma (Gomont) Anagnostidis & Komárek, 1988 (basis of record)
Blidingia Kylin, 1947 (additional source)
Blidingia minima (Nägeli ex Kützing) Kylin, 1947 (additional source)
Boergesenia J.Feldmann, 1938 (basis of record)
Boergesenia forbesii (Harvey) Feldmann, 1938 (basis of record)
Boodlea G.Murray & De Toni, 1889 (additional source)
Boodlea composita (Harvey) F.Brand, 1904 (basis of record)
Boodlea struveoides M.Howe, 1918 (additional source)
Boodlea vanbosseae Reinbold, 1905 (basis of record)
Boodleopsis A.Gepp & E.S.Gepp, 1911 (basis of record)
Bornetella Munier-Chalmas, 1877 (basis of record)
Bornetella nitida (Munier-Chalmas) Sonder, 1880 (basis of record)
Bornetella oligospora Solms-Laubach, 1892 (basis of record)
Bornetella sphaerica (Zanardini) Solms-Laubach, 1892 (basis of record)
Bostrychia Montagne, 1842 (additional source)
Bostrychia radicans (Montagne) Montagne, 1842 (additional source)
Bostrychia simpliciuscula Harvey ex J.Agardh, 1863 (basis of record)
Bostrychia tenella (J.V.Lamouroux) J.Agardh, 1863 (basis of record)
Botryocladia leptopoda (J.Agardh) Kylin, 1931 (basis of record)
Botryocladia pyriformis (Børgesen) Kylin, 1931 (additional source)
Brachytrichia Zanardini ex Bornet & Flahault, 1886 (basis of record)
Brachytrichia quoyi Bornet & Flahault, 1886 (basis of record)
Bryopsis hypnoides J.V.Lamouroux, 1809 (additional source)
Bryopsis pennata J.V.Lamouroux, 1809 (additional source)
Callithamnion Lyngbye, 1819 (additional source)
Callophyllis Kützing, 1843 (additional source)
Caloglossa (Harvey) G.Martens, 1869 (basis of record)
Caloglossa adhaerens R.J.King & Puttock, 1994 (basis of record)
Caloglossa leprieurii (Montagne) G.Martens, 1869 (basis of record)
Caloglossa ogasawaraensis Okamura, 1897 (basis of record)
Calothrix C.Agardh ex Bornet & Flahault, 1886 (basis of record)
Calothrix aeruginea Thuret ex Bornet & Flahault, 1886 (basis of record)
Calothrix confervicola C.Agardh ex Bornet & Flahault, 1886 (basis of record)
Calothrix contarenii Bornet & Flahault, 1886 (basis of record)
Calothrix crustacea Thuret ex Bornet & Flahault, 1886 accepted as Scytonematopsis crustacea (Thuret ex Bornet & Flahault) Koválik & Komárek, 1988 (basis of record)
Calothrix fuscoviolacea P.Crouan & H.Crouan ex Bornet & Flahault, 1886 (basis of record)
Calothrix pilosa Harvey ex Bornet & Flahault, 1886 accepted as Scytonematopsis pilosa (Harvey ex Bornet & Flahault) I.Umezaki & M.Watanabe, 1994 (basis of record)
Calothrix scopulorum C.Agardh ex Bornet & Flahault, 1886 (additional source)
Carpopeltis F.Schmitz, 1895 (basis of record)
Carpopeltis affinis (Harvey) Okamura, 1934 accepted as Polyopes affinis (Harvey) Kawaguchi & Wang, 2002 (basis of record)
Carpopeltis maillardii (Montagne & Millardet) Chiang, 1970 (additional source)
Carradoriella P.C.Silva, 1996 (basis of record)
Catenella Greville, 1830 (additional source)
Catenella nipae Zanardini, 1872 (basis of record)
Catenella subumbellata C.K.Tseng, 1942 (basis of record)
Caulacanthus Kützing, 1843 (additional source)
Caulacanthus ustulatus (Turner) Kützing, 1843 (additional source)
Caulerpa J.V.Lamouroux, 1809 (additional source)
Caulerpa brachypus Harvey, 1860 (basis of record)
Caulerpa mexicana Sonder ex Kützing, 1849 (additional source)
Caulerpa peltata J.V.Lamouroux, 1809 accepted as Caulerpa chemnitzia (Esper) J.V.Lamouroux, 1809 (additional source)
Caulerpa racemosa (Forsskål) J.Agardh, 1873 (additional source)
Caulerpa serrulata (Forsskål) J.Agardh, 1837 (basis of record)
Caulerpa sertularioides (S.G.Gmelin) M.Howe, 1905 (additional source)
Caulerpa taxifolia (M.Vahl) C.Agardh, 1817 (additional source)
Caulerpa urvilleana Montagne, 1845 (basis of record)
Caulerpa verticillata J.Agardh, 1847 (basis of record)
Caulerpa webbiana Montagne, 1837 (additional source)
Centroceras Kützing, 1842 '1841' (additional source)
Centroceras clavulatum (C.Agardh) Montagne, 1846 (additional source)
Centroceras minutum Yamada, 1944 (basis of record)
Ceramium Roth, 1797 (additional source)