| Callithamnion rupicolum C.L. Anderson, 1894 |
| Callithamnion rupinicola C.L. Anderson, 1894 |
| Callithamnion soccoriense W.R. Taylor, 1945 |
| Callithamnion uncinatum E.Y. Dawson, 1962 |
| Callithamnion uruguayense W.R. Taylor, 1939 |
| Callithamnion veleroae E.Y. Dawson, 1944 |
| Crouania J. Agardh, 1842 |
| Crouania attenuata (C. Agardh) J. Agardh, 1842 |
| Crouania mayae Mateo-Cid, Mendoza-González & Searles, 2002 |
| Crouania pleonospora W.R. Taylor, 1928 |
| Crouanophycus Athanas., 1998 |
| Crouanophycus mcnabbii (E.Y. Dawson) Athanas., 1998 |
| Gaillona Bonnemaison, 1828 |
| Gaillona hookeri (Dillwyn) Athanas., 2016 |
| Gaillona seposita (Gunnerus) Athanas., 2016 |
| Seirospora Harv., 1846 |
| Seirospora occidentalis Børgesen, 1909 |
| Seirospora purpurea M. Howe, 1918 |