Acrochaetium Nägeli, 1858 (basis of record)
Acrochaetium Nägeli, 1858 (extant flag source)
Acrocystis Zanardini, 1872 (extant flag source)
Acrocystis Zanardini, 1872 (basis of record)
Acrosorium Zanardini ex Kützing, 1869 (basis of record)
Acrosorium Zanardini ex Kützing, 1869 (extant flag source)
Acrosymphyton Sjöstedt, 1926 (basis of record)
Acrosymphyton Sjöstedt, 1926 (extant flag source)
Acrothamnion J.G. Agardh, 1892 (basis of record)
Acrotylus J.G. Agardh, 1849 (basis of record)
Acrotylus J.G. Agardh, 1849 (extant flag source)
Actinotrichia Decaisne, 1842 (basis of record)
Actinotrichia Decaisne, 1842 (extant flag source)
Adelophycus Kraft, 1994 (extant flag source)
Adelophycus Kraft, 1994 (basis of record)
Aeodes J.G. Agardh, 1876 (basis of record)
Aeodes J.G. Agardh, 1876 (extant flag source)
Agardhiella F. Schmitz, 1897 (basis of record)
Agardhiella F. Schmitz, 1897 (extant flag source)
Aglaothamnion G. Feldman-Mazoyer, 1941 (basis of record)
Aglaothamnion G. Feldman-Mazoyer, 1941 (extant flag source)
Ahnfeltia Fries, 1836 (extant flag source)
Ahnfeltia Fries, 1836 (basis of record)
Ahnfeltiopsis P.C. Silva & T.C. DeCew, 1992 (extant flag source)
Ahnfeltiopsis P.C. Silva & T.C. DeCew, 1992 (basis of record)
Amansia J.V.F. Lamouroux, 1809 (extant flag source)
Amansia J.V.F. Lamouroux, 1809 (basis of record)
Amoenothamnion Wollaston, 1968 (extant flag source)
Amoenothamnion Wollaston, 1968 (basis of record)
Amphiplexia J.G. Agardh, 1892 (extant flag source)
Amphiplexia J.G. Agardh, 1892 (basis of record)
Amphiroa J.V.F. Lamouroux, 1812 (extant flag source)
Amphiroa J.V.F. Lamouroux, 1812 (basis of record)
Amphisbetema Weber-van Bosse, 1913 (extant flag source)
Amphisbetema Weber-van Bosse, 1913 (basis of record)
Anisoschizus Huisman & Kraft, 1982 (basis of record)
Anisoschizus Huisman & Kraft, 1982 (extant flag source)
Anotrichium Nägeli, 1862 (basis of record)
Anotrichium Nägeli, 1862 (extant flag source)
Antithamnion Nägeli, 1847 (extant flag source)
Antithamnion Nägeli, 1847 (basis of record)
Antithamnionella Lyle, 1922 (extant flag source)
Antithamnionella Lyle, 1922 (basis of record)
Antrocentrum Kraft & Min-Thein, 1983 (extant flag source)
Antrocentrum Kraft & Min-Thein, 1983 (basis of record)
Apoglossum J.G. Agardh, 1898 (basis of record)
Apoglossum J.G. Agardh, 1898 (extant flag source)
Areschougia Harvey, 1855 (basis of record)
Areschougia Harvey, 1855 (extant flag source)
Aristothamnion J.G. Agardh, 1892 accepted as Callithamnion Lyngbye, 1819 (extant flag source)
Aristothamnion J.G. Agardh, 1892 accepted as Callithamnion Lyngbye, 1819 (basis of record)
Arthrocardia Decaisne, 1842 (extant flag source)
Arthrocardia Decaisne, 1842 (basis of record)
Asteromenia J.M. Huisman & A.J.K. Millar, 1996 (extant flag source)
Asteromenia J.M. Huisman & A.J.K. Millar, 1996 (basis of record)
Austroclonium Min-Thein & Womersley, 1976 (extant flag source)
Austroclonium Min-Thein & Womersley, 1976 (basis of record)
Austrophyllis H.B.S. Womersley & R.E. Norris, 1971 (basis of record)
Austrophyllis H.B.S. Womersley & R.E. Norris, 1971 (extant flag source)
Ballia Harvey, 1840 (extant flag source)
Ballia Harvey, 1840 (basis of record)
Balliella H. Itono & T. Tanaka, 1973 (extant flag source)
Balliella H. Itono & T. Tanaka, 1973 (basis of record)
Bangia Lyngbye, 1819 (basis of record)
Bangiopsis F. Schmitz, 1896 (basis of record)
Bangiopsis F. Schmitz, 1896 (extant flag source)
Bartoniella Kylin, 1924 (basis of record)
Bartoniella Kylin, 1924 (extant flag source)
Beckerella Kylin, 1956 accepted as Ptilophora Kützing, 1847 (extant flag source)
Beckerella Kylin, 1956 accepted as Ptilophora Kützing, 1847 (basis of record)
Betaphycus Doty, 1996 (extant flag source)
Betaphycus Doty, 1996 (basis of record)
Bornetia Thuret, 1855 (extant flag source)
Bornetia Thuret, 1855 (basis of record)
Boryna Grateloup ex Bory de Saint-Vincent, 1822 (extant flag source)
Boryna Grateloup ex Bory de Saint-Vincent, 1822 (basis of record)
Bostrychia Montagne in Sagra, 1842 (basis of record)
Bostrychia Montagne in Sagra, 1842 (extant flag source)
Botryocladia (J.G. Agardh) Kylin, 1931 (basis of record)
Botryocladia (J.G. Agardh) Kylin, 1931 (extant flag source)
Botryoglossum Kützing, 1843 (extant flag source)
Botryoglossum Kützing, 1843 (basis of record)
Branchioglossum Kylin, 1924 (extant flag source)
Branchioglossum Kylin, 1924 (basis of record)
Brongniartella Bory de Saint-Vincent, 1822 (basis of record)
Brongniartella Bory de Saint-Vincent, 1822 (extant flag source)
Bryocladia F. Schmitz, 1897 (basis of record)
Bryocladia F. Schmitz, 1897 (extant flag source)
Bryothamnion Kützing, 1843 accepted as Alsidium C.A. Agardh, 1827 (extant flag source)
Bryothamnion Kützing, 1843 accepted as Alsidium C.A. Agardh, 1827 (basis of record)
Calliblepharis Kützing, 1843 (basis of record)
Calliblepharis Kützing, 1843 (extant flag source)
Callithamniella G. Feldman-Mazoyer, 1938 (extant flag source)
Callithamniella G. Feldman-Mazoyer, 1938 (basis of record)
Callithamnion Lyngbye, 1819 (extant flag source)
Callithamnion Lyngbye, 1819 (basis of record)
Callophycus Trevisan, 1848 (extant flag source)
Callophycus Trevisan, 1848 (basis of record)
Callophyllis Kützing, 1843 (basis of record)
Callophyllis Kützing, 1843 (extant flag source)