| Champia Desvaux, 1809 |
| Champia caespitosa E.Y. Dawson, 1944 |
| Champia compressa Harv., 1838 |
| Champia disticha E.Y. Dawson, 1944 |
| Champia minuscula A.B. Joly & Ugadim, 1965 |
| Champia parvula (C. Agardh) Harv., 1853 |
| Champia parvula var. parvula (C. Agardh) Harvey, 1853 |
| Champia parvula var. prostrata Williams, 1951 |
| Champia salicornioides Harv., 1853 |
| Champiaceae Kütz., 1843 |
| Chylocladia Grev., 1833 |
| Chylocladia baileyana Harvey, 1853 |
| Chylocladia divaricata Harv., 1853 |
| Coeloseira Hollenberg, 1941 |
| Coeloseira compressa Hollenberg, 1941 |
| Coeloseira parva Hollenberg, 1941 |
| Coelothrix Børgesen, 1920 |
| Coelothrix irregularis (Harv.) Børgesen, 1920 |
| Gastridium Lyngb., 1819 |
| Gastridium ovale Lyngb., 1819 |