| Name | Nostoc spongiiforme C. Agardh ex Bornet & Flahault |
| Authorship | C. Agardh ex Bornet & Flahault |
| Rank | Species |
| Placed in | Nostoc Vaucher ex Bornet & Flahault |
| Citation | 1888 Ann. Sci. Nat., Bot. ser. 7, 7: 197 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Nostoc spongiiforme C. Agardh ex Bornet & Flahault |
| Identification made in | [no date] (2) |
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