| Callithamnion bisporum var. australe E.Y. Dawson, 1962 |
| Callithamnion breviramosum N.L. Gardner, 1927 |
| Callithamnion brodiei Harv., 1833 |
| Callithamnion byssoides Arnott ex Harv., 1833 |
| Callithamnion catalinense E.Y. Dawson, 1962 |
| Callithamnion compactum E.Y. Dawson, 1962 |
| Callithamnion cordatum Børgesen, 1909 |
| Callithamnion corymbosum (Sm.) Lyngb., 1819 |
| Callithamnion dasytrichum (Mont.) Mont., 1842 |
| Callithamnion endovagum Setch. & N.L. Gardner, 1924 |
| Callithamnion felipponei M. Howe, 1931 |
| Callithamnion halliae Collins, 1900 |
| Callithamnion lejolisea Farlow, 1877 |
| Callithamnion marshallense E.Y. Dawson, 1957 |
| Callithamnion neglectum (Feldm. -Maz.) Wynne, 1986 |
| Callithamnion pacificum Taylor, 1945 |
| Callithamnion paschale Børgesen, 1924 |
| Callithamnion ramosissimum N.L. Gardner, 1927 |
| Callithamnion rigidum E.Y. Dawson, 1962 |
| Callithamnion rupicola C.L. Anderson, 1894 |