| Name | Polysiphonia opaca (C.Agardh) Moris & De Notaris |
| Authorship | (C. Agardh) Moris & De Notaris |
| Rank | Species |
| NomenclaturalStatus | Unknown |
| Placed in | Polysiphonia Greville |
| Contains | Polysiphonia opaca var. repens Kützing Polysiphonia opaca var. tripinnata (J. Agardh) Ardissone |
| Remarks | Created from Taxon Name Import: Polysiphonia opaca (C.Agardh) Moris & De Notaris |
| GUID | urn:lsid:marinespecies.org:taxname:144653 |
| Holdings | 5 Specimens held in the Harvard University Herbaria identified as Polysiphonia opaca (C.Agardh) Moris & De Notaris |
| Identification made in | [no date] (5) |