Acanthophora J.V.Lamouroux, 1813 (basis of record)
Acanthophora muscoides (Linnaeus) Bory de Saint-Vincent, 1828 (basis of record)
Acanthophora nayadiformis (Delile) Papenfuss, 1968 (additional source)
Acetabularia J.V.Lamouroux, 1812 (basis of record)
Acetabularia parvula Solms-Laubach, 1895 accepted as Parvocaulis parvulus (Solms-Laubach) S.Berger, Fettweiss, Gleissberg, Liddle, U.Richter, Sawitzky & Zuccarello, 2003 (basis of record)
Acetabularia polyphysoides P.Crouan & H.Crouan, 1865 accepted as Parvocaulis polyphysoides (P.Crouan & H.Crouan) S.Berger & al. ex J.N.Norris & D.L.Ballantine, 2023 (basis of record)
Acinetospora Bornet, 1891 (basis of record)
Acinetospora crinita (Carmichael) Sauvageau, 1899 (basis of record)
Acrochaete N.Pringsheim, 1862 accepted as Ulvella P.L.Crouan & H.M.Crouan, 1859 (basis of record)
Acrochaete cladophorae (Hornby) R.Nielsen, 1995 accepted as Ulvella cladophorae (Hornby) A.C.Mathieson & Dawes, 2017 (basis of record)
Acrochaete geniculata (N.L.Gardner) O'Kelly, 1983 accepted as Ulvella geniculata (N.L.Gardner) R.Nielsen, C.J.O'Kelly & B. Wysor, 2013 (basis of record)
Acrochaete heteroclada J.A.Correa & R.Nielsen, 1988 accepted as Ulvella heteroclada (Correa & R.Nielsen)R.Nielsen, C.J.O'Kelly & B.Wysor, 2013 (basis of record)
Acrochaete inflata (Ercegovic) Gallardo, Gómez Garreta, M.A.Ribera, Cormaci, G.Furnari, Giaccone & Boudouresque, 1993 accepted as Ulvella inflata (Ercegovic) R.Nielsen, C.J.O'Kelly & B. Wysor, 2013 (basis of record)
Acrochaete leptochaete (Huber) R.Nielsen, 1983 accepted as Ulvella leptochaete (Huber) R.Nielsen, C.J.O'Kelly & B.Wysor, 2013 (basis of record)
Acrochaete operculata J.A.Correa & R.Nielsen, 1988 accepted as Ulvella operculata (Correa & R.Nielsen) R.Nielsen, C.J.O'Kelly & B.Wysor, 2013 (basis of record)
Acrochaete polymorpha (L.Moewus) R.Nielsen, 1988 accepted as Ulvella leptochaete (Huber) R.Nielsen, C.J.O'Kelly & B.Wysor, 2013 (basis of record)
Acrochaete repens Pringsheim, 1862 accepted as Ulvella repens (Pringsheim) R.Nielsen, C.J.O'Kelly & B.Wysor, 2013 (basis of record)
Acrochaete viridis (Reinke) R.Nielsen, 1979 accepted as Ulvella viridis (Reinke) R.Nielsen, C.J.O'Kelly & B.Wysor, 2013 (basis of record)
Acrochaete wittrockii (Wille) R.Nielsen, 1983 accepted as Ulvella wittrockii (Wille) R.Nielsen, C.J.O'Kelly & B.Wysor, 2013 (basis of record)
Acrochaetiaceae Melchior, 1954 (basis of record)
Acrochaetiales (basis of record)
Acrochaetium Nägeli, 1858 (basis of record)
Acrochaetium alariae (Jónsson) Bornet, 1904 (basis of record)
Acrochaetium asparagopsis (Chemin) Papenfuss, 1945 accepted as Colaconema asparagopsis Chemin, 1926 (basis of record)
Acrochaetium balticum (Rosenvinge) Aleem & Schulz, 1952 (basis of record)
Acrochaetium barbadensis (Vickers) Borgesen, 1915 (basis of record)
Acrochaetium battersianum Hamel, 1927 (basis of record)
Acrochaetium boergesenii Schiffner, 1931 (basis of record)
Acrochaetium bonnemaisoniae (Batters) Feldmann & G.Feldmann, 1940 accepted as Colaconema bonnemaisoniae Batters, 1896 (basis of record)
Acrochaetium brebneri (Batters) Hamel, 1928 (basis of record)
Acrochaetium caespitosum (J.Agardh) Nägeli, 1862 accepted as Colaconema caespitosum (J.Agardh) Jackelman, Stegenga & J.J.Bolton, 1991 (basis of record)
Acrochaetium canariense Børgesen, 1927 (basis of record)
Acrochaetium catenulatum M.Howe, 1914 (basis of record)
Acrochaetium cheminii Feldmann, 1954 (basis of record)
Acrochaetium chylocladiae (Batters) Batters, 1902 accepted as Colaconema chylocladiae Batters, 1896 (basis of record)
Acrochaetium codicolum Børgesen, 1927 accepted as Acrochaetium codicola Børgesen, 1927 accepted as Colaconema codicola (Børgesen) Stegenga, J.J.Bolton & R.J.Anderson, 1997 (basis of record)
Acrochaetium codii Hamel, 1927 accepted as Colaconema caespitosum (J.Agardh) Jackelman, Stegenga & J.J.Bolton, 1991 (basis of record)
Acrochaetium corymbiferum (Thuret) Batters, 1902 accepted as Colaconema corymbiferum (Thuret) Alongi, Cormaci & G.Furnari, 2017 (basis of record)
Acrochaetium crassipes (Børgesen) Børgesen, 1915 (basis of record)
Acrochaetium cymopoliae Børgesen, 1927 (basis of record)
Acrochaetium cytophagum (Rosenvinge) Hamel, 1927 (basis of record)
Acrochaetium daviesii (Dillwyn) Nägeli, 1862 accepted as Colaconema daviesii (Dillwyn) Stegenga, 1985 (basis of record)
Acrochaetium densum (K.M.Drew) Papenfuss, 1945 accepted as Acrochaetium catenulatum M.Howe, 1914 (basis of record)
Acrochaetium duboscqii Feldmann, 1935 (basis of record)
Acrochaetium dumontiae (Rosenvinge) Hamel, 1927 (basis of record)
Acrochaetium efflorescens (J.Agardh) Nägeli, 1861 accepted as Grania efflorescens (J.Agardh) Kylin, 1944 (basis of record)
Acrochaetium emergens (Rosenvinge) Weber Bosse, 1921 accepted as Colaconema emergens (Rosenvinge) R.Nielsen, 1994 (basis of record)
Acrochaetium endophyticum Batters, 1896 accepted as Kylinia endophytica (Batters) Athanasiadis, 1996 (basis of record)
Acrochaetium endozoicum (Darbishire) Batters, 1902 (basis of record)
Acrochaetium extensum Ercegovic, 1957 (basis of record)
Acrochaetium gracile Børgesen, 1915 accepted as Colaconema gracile (Børgesen) Ateweberhan & Prud'homme van Reine, 2005 (basis of record)
Acrochaetium gynandrum (Rosenvinge) Hamel, 1927 accepted as Colaconema gynandrum (Rosenvinge) R.Nielsen, 1994 (basis of record)
Acrochaetium hallandicum (Kylin) Hamel, 1927 accepted as Colaconema hallandicum (Kylin) Afonso-Carillo, Sanson, Sangil & Diaz-Villa, 2007 (basis of record)
Acrochaetium hauckii Schiffner, 1916 (basis of record)
Acrochaetium humile (Rosenvinge) Børgesen, 1915 (basis of record)
Acrochaetium immersum (Rosenvinge) Hamel, 1927 (basis of record)
Acrochaetium inclusum (Levring) Papenfuss, 1945 (basis of record)
Acrochaetium incrassatum Ercegovic, 1957 (basis of record)
Acrochaetium infestans M.Howe & Hoyt, 1916 accepted as Colaconema infestans (M.Howe & Hoyt) Woelkerling, 1973 (basis of record)
Acrochaetium kylinii Hamel, 1927 (basis of record)
Acrochaetium lenormandii (Suhr ex Kützing) Nägeli, 1862 accepted as Acrochaetium secundatum (Lyngbye) Nägeli, 1858 (basis of record)
Acrochaetium leptonema (Rosenvinge) Børgesen, 1915 accepted as Colaconema leptonema (Rosenvinge) Alongi, Cormaci & G.Furnari, 2017 (basis of record)
Acrochaetium liagorae Børgesen, 1915 (basis of record)
Acrochaetium lorrain-smithiae (Lyle) L.Newton, 1931 (basis of record)
Acrochaetium macula (Rosenvinge) Hamel, 1927 (basis of record)
Acrochaetium mediterraneum (Levring) Athanasiadis, 2003 (basis of record)
Acrochaetium microfilum C.-C.Jao, 1936 (basis of record)
Acrochaetium microscopicum (Nägeli ex Kützing) Nägeli, 1858 (basis of record)
Acrochaetium minutissimum (Shur) Nägeli, 1861 accepted as Acrochaetium minutissimum Nägeli, 1862 accepted as Acrochaetium minutum (Suhr) Hamel, 1927 (basis of record)
Acrochaetium minutum (Suhr) Hamel, 1927 (basis of record)
Acrochaetium molinieri Coppejans & Boudouresque, 1976 (basis of record)
Acrochaetium moniliforme (Rosenvinge) Børgesen, 1915 (basis of record)
Acrochaetium naumannii (Askenasy) Askenasy accepted as Colaconema naumannii (Askenasy) Prud'homme van Reine, Haroun & Kostermans, 2019 (basis of record)
Acrochaetium nemalii (De Notaris ex Dufour) Børgesen, 1915 accepted as Colaconema nemalionis (De Notaris ex L.Dufour) Stegenga, 1985 (basis of record)
Acrochaetium nitophyllii (Levring) Papenfuss, 1945 (basis of record)
Acrochaetium occidentale Børgesen, 1915 accepted as Acrochaetium barbadense (Vickers) Børgesen, 1915 (basis of record)
Acrochaetium pallens (Zanardini) Nägeli, 1862 (basis of record)
Acrochaetium parvulum (Kylin) Hoyt, 1920 (basis of record)
Acrochaetium polyblastum (Rosenvinge) Børgesen, 1915 accepted as Colaconema hallandicum (Kylin) Afonso-Carillo, Sanson, Sangil & Diaz-Villa, 2007 (basis of record)
Acrochaetium pulchellum Børgesen, 1915 (basis of record)
Acrochaetium radiatum C.-C.Jao, 1936 accepted as Acrochaetium humile (Rosenvinge) Børgesen, 1915 (basis of record)
Acrochaetium reductum (Rosenvinge) Hamel, 1927 (basis of record)
Acrochaetium rhipidandrum (Rosenvinge) Hamel, 1927 accepted as Acrochaetium secundatum (Lyngbye) Nägeli, 1858 (basis of record)
Acrochaetium robustum Børgesen, 1915 accepted as Colaconema robustum (Børgesen) Huisman & Woelkerling, 2018 (basis of record)
Acrochaetium rosulata (Rosenvinge) Papenfuss accepted as Acrochaetium rosulatum (Rosenvinge) Papenfuss, 1945 accepted as Kylinia rosulata Rosenvinge, 1909 (basis of record)
Acrochaetium sanctae-mariae (Darbishire) Hamel, 1927 (basis of record)
Acrochaetium savianum (Meneghini) Nägeli, 1862 accepted as Colaconema savianum (Meneghini) R.Nielsen, 1994 (basis of record)
Acrochaetium secundatum (Lyngbye) Nägeli, 1858 (basis of record)
Acrochaetium sparsum (Harvey) Nägeli, 1862 (basis of record)
Acrochaetium stilophorae (Levring) Kylin, 1944 (basis of record)
Acrochaetium subpinnatum Bornet ex Hamel, 1927 (basis of record)
Acrochaetium subseriatum Børgesen, 1932 (basis of record)
Acrochaetium subtilissimum (Kützing) Hamel, 1927 accepted as Colaconema subtilissimum (Kützing) Alongi, Cormaci & G.Furnari, 2017 (basis of record)
Acrochaetium thuretii (Bornet) Collins & Hervey, 1917 accepted as Grania efflorescens (J.Agardh) Kylin, 1944 (basis of record)
Acrochaetium trifilum (Buffham) Batters, 1902 (basis of record)
Acrochaetium unifilum C.-C.Jao, 1936 (basis of record)
Acrochaetium virgatulum (Harvey) Batters, 1902 accepted as Acrochaetium secundatum (Lyngbye) Nägeli, 1858 (basis of record)
Acrocytis Rosenvinge, 1933 (basis of record)
Acrocytis groenlandica Rosenvinge (basis of record)
Acrodiscus Zanardini, 1869 (basis of record)

European waters (ERMS scope) for Acanthophora muscoides (Linnaeus) Bory de Saint-Vincent, 1828 
European waters (ERMS scope) for Acanthophora nayadiformis (Delile) Papenfuss, 1968 
European waters (ERMS scope) for Acetabularia acetabulum (Linnaeus) P.C. Silva, 1952 
European waters (ERMS scope) for Acetabularia caliculus J.V.Lamouroux, 1824 
European waters (ERMS scope) for Acetabularia parvula Solms-Laubach, 1895 
European waters (ERMS scope) for Acetabularia polyphysoides P.Crouan & H.Crouan, 1865 
European waters (ERMS scope) for Acinetospora crinita (Carmichael) Sauvageau, 1899 
European waters (ERMS scope) for Acrochaete cladophorae (Hornby) R.Nielsen, 1995 
European waters (ERMS scope) for Acrochaete geniculata (N.L.Gardner) O'Kelly, 1983 
European waters (ERMS scope) for Acrochaete heteroclada J.A.Correa & R.Nielsen, 1988 
European waters (ERMS scope) for Acrochaete inflata (Ercegovic) Gallardo, Gómez Garreta, M.A.Ribera, Cormaci, G.Furnari, Giaccone & Boudouresque, 1993 
European waters (ERMS scope) for Acrochaete leptochaete (Huber) R.Nielsen, 1983 
European waters (ERMS scope) for Acrochaete operculata J.A.Correa & R.Nielsen, 1988 
European waters (ERMS scope) for Acrochaete polymorpha (L.Moewus) R.Nielsen, 1988 
European waters (ERMS scope) for Acrochaete repens Pringsheim, 1862 
European waters (ERMS scope) for Acrochaete viridis (Reinke) R.Nielsen, 1979 
European waters (ERMS scope) for Acrochaete wittrockii (Wille) R.Nielsen, 1983 
European waters (ERMS scope) for Acrochaetium alariae (Jónsson) Bornet, 1904 
European waters (ERMS scope) for Acrochaetium asparagopsis (Chemin) Papenfuss, 1945 
European waters (ERMS scope) for Acrochaetium balticum (Rosenvinge) Aleem & Schulz, 1952 
European waters (ERMS scope) for Acrochaetium barbadensis (Vickers) Borgesen, 1915 
European waters (ERMS scope) for Acrochaetium battersianum Hamel, 1927 
European waters (ERMS scope) for Acrochaetium boergesenii Schiffner, 1931 
European waters (ERMS scope) for Acrochaetium bonnemaisoniae (Batters) Feldmann & G.Feldmann, 1940 
European waters (ERMS scope) for Acrochaetium brebneri (Batters) Hamel, 1928 
European waters (ERMS scope) for Acrochaetium caespitosum (J.Agardh) Nägeli, 1862 
European waters (ERMS scope) for Acrochaetium canariense Børgesen, 1927 
European waters (ERMS scope) for Acrochaetium catenulatum M.Howe, 1914 
European waters (ERMS scope) for Acrochaetium cheminii Feldmann, 1954 
European waters (ERMS scope) for Acrochaetium chylocladiae (Batters) Batters, 1902 
European waters (ERMS scope) for Acrochaetium codicolum Børgesen, 1927 
European waters (ERMS scope) for Acrochaetium codii Hamel, 1927 
European waters (ERMS scope) for Acrochaetium corymbiferum (Thuret) Batters, 1902 
European waters (ERMS scope) for Acrochaetium crassipes (Børgesen) Børgesen, 1915 
European waters (ERMS scope) for Acrochaetium cymopoliae Børgesen, 1927 
European waters (ERMS scope) for Acrochaetium cytophagum (Rosenvinge) Hamel, 1927 
European waters (ERMS scope) for Acrochaetium daviesii (Dillwyn) Nägeli, 1862 
European waters (ERMS scope) for Acrochaetium densum (K.M.Drew) Papenfuss, 1945 
European waters (ERMS scope) for Acrochaetium duboscqii Feldmann, 1935 
European waters (ERMS scope) for Acrochaetium dumontiae (Rosenvinge) Hamel, 1927 
European waters (ERMS scope) for Acrochaetium efflorescens (J.Agardh) Nägeli, 1861 
European waters (ERMS scope) for Acrochaetium emergens (Rosenvinge) Weber Bosse, 1921 
European waters (ERMS scope) for Acrochaetium endophyticum Batters, 1896 
European waters (ERMS scope) for Acrochaetium endozoicum (Darbishire) Batters, 1902 
European waters (ERMS scope) for Acrochaetium extensum Ercegovic, 1957 
European waters (ERMS scope) for Acrochaetium gracile Børgesen, 1915 
European waters (ERMS scope) for Acrochaetium gynandrum (Rosenvinge) Hamel, 1927 
European waters (ERMS scope) for Acrochaetium hallandicum (Kylin) Hamel, 1927 
European waters (ERMS scope) for Acrochaetium hauckii Schiffner, 1916 
European waters (ERMS scope) for Acrochaetium humile (Rosenvinge) Børgesen, 1915 
European waters (ERMS scope) for Acrochaetium immersum (Rosenvinge) Hamel, 1927 
European waters (ERMS scope) for Acrochaetium inclusum (Levring) Papenfuss, 1945 
European waters (ERMS scope) for Acrochaetium incrassatum Ercegovic, 1957 
European waters (ERMS scope) for Acrochaetium infestans M.Howe & Hoyt, 1916 
European waters (ERMS scope) for Acrochaetium kylinii Hamel, 1927 
European waters (ERMS scope) for Acrochaetium lenormandii (Suhr ex Kützing) Nägeli, 1862 
European waters (ERMS scope) for Acrochaetium leptonema (Rosenvinge) Børgesen, 1915 
European waters (ERMS scope) for Acrochaetium liagorae Børgesen, 1915 
European waters (ERMS scope) for Acrochaetium lorrain-smithiae (Lyle) L.Newton, 1931 
European waters (ERMS scope) for Acrochaetium macula (Rosenvinge) Hamel, 1927 
European waters (ERMS scope) for Acrochaetium mediterraneum (Levring) Athanasiadis, 2003 
European waters (ERMS scope) for Acrochaetium microfilum C.-C.Jao, 1936 
European waters (ERMS scope) for Acrochaetium microscopicum (Nägeli ex Kützing) Nägeli, 1858 
European waters (ERMS scope) for Acrochaetium minutissimum (Shur) Nägeli, 1861 
European waters (ERMS scope) for Acrochaetium minutum (Suhr) Hamel, 1927 
European waters (ERMS scope) for Acrochaetium mirabile (Suhr) Nägeli, 1862 
European waters (ERMS scope) for Acrochaetium molinieri Coppejans & Boudouresque, 1976 
European waters (ERMS scope) for Acrochaetium moniliforme (Rosenvinge) Børgesen, 1915 
European waters (ERMS scope) for Acrochaetium naumannii (Askenasy) Askenasy 
European waters (ERMS scope) for Acrochaetium nemalii (De Notaris ex Dufour) Børgesen, 1915 
European waters (ERMS scope) for Acrochaetium nemalii (De Notaris ex Dufour) Børgesen, 1915 
European waters (ERMS scope) for Acrochaetium nitophyllii (Levring) Papenfuss, 1945 
European waters (ERMS scope) for Acrochaetium occidentale Børgesen, 1915 
European waters (ERMS scope) for Acrochaetium pallens (Zanardini) Nägeli, 1862 
European waters (ERMS scope) for Acrochaetium parvulum (Kylin) Hoyt, 1920 
European waters (ERMS scope) for Acrochaetium polyblastum (Rosenvinge) Børgesen, 1915 
European waters (ERMS scope) for Acrochaetium pulchellum Børgesen, 1915 
European waters (ERMS scope) for Acrochaetium radiatum C.-C.Jao, 1936 
European waters (ERMS scope) for Acrochaetium reductum (Rosenvinge) Hamel, 1927 
European waters (ERMS scope) for Acrochaetium rhipidandrum (Rosenvinge) Hamel, 1927 
European waters (ERMS scope) for Acrochaetium robustum Børgesen, 1915 
European waters (ERMS scope) for Acrochaetium rosulata (Rosenvinge) Papenfuss 
European waters (ERMS scope) for Acrochaetium sanctae-mariae (Darbishire) Hamel, 1927 
European waters (ERMS scope) for Acrochaetium savianum (Meneghini) Nägeli, 1862 
European waters (ERMS scope) for Acrochaetium secundatum (Lyngbye) Nägeli, 1858 
European waters (ERMS scope) for Acrochaetium seiriolanum (Harvey-Gibson) Hamel, 1927 
European waters (ERMS scope) for Acrochaetium sparsum (Harvey) Nägeli, 1862 
European waters (ERMS scope) for Acrochaetium stilophorae (Levring) Kylin, 1944 
European waters (ERMS scope) for Acrochaetium subpinnatum Bornet ex Hamel, 1927 
European waters (ERMS scope) for Acrochaetium subseriatum Børgesen, 1932 
European waters (ERMS scope) for Acrochaetium subtilissimum (Kützing) Hamel, 1927 
European waters (ERMS scope) for Acrochaetium thuretii (Bornet) Collins & Hervey, 1917 
European waters (ERMS scope) for Acrochaetium trifilum (Buffham) Batters, 1902 
European waters (ERMS scope) for Acrochaetium unifilum C.-C.Jao, 1936 
European waters (ERMS scope) for Acrochaetium virgatulum (Harvey) Batters, 1902 
European waters (ERMS scope) for Acrocytis groenlandica Rosenvinge 
European waters (ERMS scope) for Acrodiscus vidovichii (Meneghini) Zanardini, 1868 
European waters (ERMS scope) for Acrosiphonia arcta (Dillwyn) Gain, 1912 
European waters (ERMS scope) for Acrosiphonia arctiuscula (Kützing) Jónsson 
European waters (ERMS scope) for Acrosiphonia flagellata Kjellman, 1893 

 Spelling

 for Lithophyllum duckerae Woelkerling, 1983

Lithophyllum duckeri Woelkerling, 1983 [details]

 Spelling

 for Lithophyllum vickersii M.Lemoine

Lithophyllum vickersiae M. Lemoine, 1929 [details]

 Taxonomy

 for Coccomyxa Schmidle, 1901

Also in database as valid genus in Myxidiidae (Myxospora)-needs checking [details]

 Taxonomy

 for Saccorhiza Bachelot de la Pylaie, 1830

Also in database as valid genus in Hippocrepinidae [details]