Callithamnion byssoides var. pseudobyssoides (P.Crouan & H.Crouan) Miranda, 1932 variety synonym

Callithamnion hiemale Kjellman, 1907 species synonym

Callithamnion borgesenii Aponte & D.L.Ballant. species synonym

Seirospora gaillonii (P.L.Crouan & H.M.Crouan) De Toni, 1903 species synonym

Callithamnion gailloni (P.L.Crouan & H.M.Crouan) P.L.Crouan & H.M.Crouan, 1851 species synonym

Aglaothamnion byssoides (Arnott ex Harvey) C.F.Boudouresque & M.B.Perret-Boudouresque species synonym

Aglaothamnion rabenhorstii (Kütz.) L'Hardy-Halos species accepted

Callithamnion byssoides var. jamaicensis Collins variety synonym

Aglaothamnion monopodum species accepted

Ceramium tenuissimum Bonnemaison species synonym

Ceramium gaillonii P.L.Crouan & H.M.Crouan, 1839 species synonym

Aglaothamnion collinsii Aponte, D.L.Ballantine & J.N.Norris, 1997 species accepted

Aglaothamnion cordatum (Børgesen) Feldm.-Maz. species accepted

Aglaothamnion neglectum Feldm.-Maz. species synonym

Callithamnion cordatum Børgesen species synonym

Callithamnion neglectum (Feldmann-Mazoyer) M.J.Wynne species synonym

Aglaothamnion diaphanum L'Hardy-Halos & Maggs species accepted

Aglaothamnion tenuissimum (Bonnemaison) Feldmann-Mazoyer species accepted

Callithamnion byssoides Arnott ex Harvey species synonym

Aglaothamnion furcellariae (J.Agardh) Feldmann-Mazoyer species synonym

Aglaothamnion byssoides (Arnott ex Harvey) L'Hardy-Halos & Rueness species synonym

Callithamnion hiemale Kjellman ex Kylin species synonym

Callithamnion furcellariae J.Agardh species synonym

Callithamnion arnottii Trevisan species synonym

Aglaothamnion felipponei (M.Howe) N.Aponte et al. species accepted

Aglaothamnion fasciculatum (Harvey) Maggs & L'Hardy-Halos, 1993 species accepted

Pleonosporium borreri var. fasciculatum (Harvey) Holmes & Batters, 1891 variety synonym

Callithamnion fasciculatum Harvey, 1833 species synonym

Aglaothamnion uruguayense (W.R.Taylor) N.Aponte et al. species accepted

Aglaothamnion halliae (F.S.Collins) N.E.Aponte, D.L.Ballantine & J.N.Norris species accepted

Callithamnion halliae F.S.Collins species synonym

Aglaothamnion westbrookiae Rueness & L'Hardy-Halos species synonym

Aglaothamnion hervey (M.Howe) N.Aponte et al. species accepted

Aglaothamnion feldmanniae Halos, 1965 species accepted

Callithamnion feldmanniae (Halos) G.R.South & Tittley species synonym

Aglaothamnion chadefaudii L'Hardy-Halos, 1984 species accepted

Callithamnion chadefaudii (L'Hardy-Halos) G.R.South & Tittley, 1986 species synonym

Aglaothamnion endovagum species accepted

Callithamnion endovagum species synonym

Aglaothamnion priceanum Maggs, Guiry & Rueness, 1991 species accepted

Aglaothamnion pseudobyssoides (P.Crouan & H.Crouan) L'Hardy-Halos species accepted

Callithamnion pseudobyssoides P.L.Crouan & H.M.Crouan, 1867 species synonym

Aglaothamnion gaillonii (P.L.Crouan & H.M.Crouan) Halos, 1965 species accepted

Aglaothamnion boergesenii (Aponte & D.L.Ballant.) L'Hardy-Halos & Rueness, 1997 species accepted

Callithamnion boergesenii Aponte & Ballantine, 1990 species synonym

Aglaothamnion tripinnatum (C.Agardh) Feldm.-Maz. species accepted

Callithamnion tripinnatum C.Agardh species synonym

Phlebothamnion tripinnatum (C.Agardh) Kütz., 1849 species synonym

Aglaothamnion caudatum (J.Agardh) Feldmann-Mazoyer, 1941 species accepted

Callithamnion caudatum J.Agardh, 1841 species synonym

Aglaothamnion bipinnatum (P.L.Crouan & H.M.Crouan) Feldmann-Mazoyer species accepted

Callithamnion bipinnatum P.L. & H.M.Crouan species synonym

Callithamnion uruguayense W.R.Taylor species synonym

Callithamnion rabenhorstii (Kütz.) P.L.Crouan & H.M.Crouan, 1867 species synonym

Aglaothamnion chaudefaudii L'Hardy-Halos species synonym

Aglaothamnion cordatum Børgesen species synonym

Callithamnion arachnoideum C.Agardh, 1828 species synonym

Poecilothamnion gaillonii (P.Crouan & H.Crouan) Nägeli species synonym

Leptothamnion rabenhorstii Kütz., 1849 species synonym

Aglaothamnion sarcodiae species accepted

Aglaothamnion borgesenii (N.Aponte & D.L.Ballant.) L'Hardy-Halos & Rueness species accepted

Callithamnion felliponei M.Howe species synonym

Maschalosporium gaillonii (P.Crouan & H.Crouan) Nägeli species synonym