| Name | Cylindrospermum elongatum Kützing |
| Authorship | Kützing |
| Rank | Species |
| NomenclaturalStatus | NomInvalid |
| Placed in | Cylindrospermum Kützing ex Bornet & Flahault |
| Remarks | Bornet & Flahault (Ann. Sci. Nat. Bot. ser. 7, 7: 255. 1888) treated C. elongatum as a synonym of Anabaena oscillarioides Bory |
| Citation | 1849 Sp. Alg. [Kützing] 294 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Cylindrospermum elongatum Kützing |
| Identification made in | [no date] (2) |