| Rhizoclonium kochianum Kütz., 1845 |
| Rhizoclonium kochianum var. kerneri (Stockm.) G. Hamel |
| Rhizoclonium lubricum Setch. & N.L. Gardner, 1919 |
| Rhizoclonium riparium (Roth) Kütz. ex Harv., 1849 |
| Rhizoclonium riparium var. implexum (Dillwyn) Rosenv., 1893 |
| Rhizoclonium riparium var. riparium (Roth) Harv., 1849 |
| Rhizoclonium tortuosum (Dillwyn) Kütz., 1845 |
| Willeella Børgesen, 1930 |
| Willeella brachyclados (C. Mont.) M.J. Wynne, 2016 |
| Willeella mexicana E.Y. Dawson, 1950 |
| Willeella montagneana (Kütz.) Boedeker, 2016 |