| Synonym | Author | CoL Status | Valid | Synonymy | Combination |
|---|---|---|---|---|---|
| Capraella fragilis | (Harvey) J. De Toni, 1936 | synonym | No | junior synonym |
new combination |
| Hemitrema fragilis | (Harvey) E.Y. Dawson, 1957 | synonym | No | junior synonym |
new combination |
| Martensia fragilis | Harvey, 1854 | accepted name | Yes | senior synonym |
original combination |
| Martensia gabriellei | P.L. Crouan & H.M. Crouan, 1865 | synonym | No | junior synonym |
original combination |
| Martensia pavonia | (J.Agardh) J.Agardh, 1863 | synonym | No | senior synonym |
original combination |
| Mesotrema fragilis | (Harvey) Papenfuss, 1942 | synonym | No | junior synonym |
new combination |
| Mesotrema pavonia | J. Agardh, 1854 | synonym | No | junior synonym |
original combination |