| Name | Polysiphonia elongata (Hudson) Sprengel |
| Authorship | (Hudson) Sprengel |
| Rank | Species |
| NomenclaturalStatus | Unknown |
| Placed in | Polysiphonia Greville |
| Remarks | Created from Taxon Name Import: Polysiphonia elongata (Hudson) Sprengel |
| Holdings | 12 Specimens held in the Harvard University Herbaria identified as Polysiphonia elongata (Hudson) Sprengel |
| Identification made in | [no date] (11), 1959 (1) |