| Name | Hormosiphon stagnalis Kützing |
| Authorship | Kützing |
| Rank | Species |
| NomenclaturalStatus | NomInvalid |
| Placed in | Hormosiphon Kützing |
| Remarks | Bornet & Flahault (Ann. Sci. Nat., Bot., ser. 7, 7: 197. 1888) treated "Hormosiphon stagnalis" as a synonym of Nostoc spongiforme C. Agardh ex Bornet & Flahault |
| Citation | 1850 Tab. Phycol. 2: 7, t. 27, fig. III |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Hormosiphon stagnalis Kützing |
| Identification made in | [no date] (1) |
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