| Nominal Species (n = 11) | Present allocation (n = 6) | Ref. |
|---|---|---|
| Plocamium abnorme Hooker & Harvey, 1845 | Plocamium angustum | 3477 |
| Thamnophora angusta Agardh, 1841 | Plocamium angustum | 3477 |
| Plocamium angustatum Kützing, 1866 | Plocamium angustum | 84290 |
| Plocamium botryoides Kützing, 1866 | Plocamium angustum | 3477 |
| Plocamium brachiocarpum Kützing | Plocamium brachiocarpum | 80701 |
| Plocamium dispermum Harvey, 1855 | Plocamium angustum | 3477 |
| Plocamium gracile Agardh, 1876 | Plocamium angustum | 3477 |
| Plocamium hamatum J. Agardh | Plocamium hamatum | 80701 |
| Plocamium hookeri Harvey | Plocamium hookeri | 80701 |
| Plocamium microcladioides G.R. South & N.M. Adams | Plocamium microcladioides | 80701 |
| Plocamium minutum Levring | Plocamium minutum | 80701 |