| Name | Nostoc commune var. fuscum Kützing |
| Authorship | Kützing |
| Rank | Variety |
| Placed in | Nostoc commune Vaucher ex Bornet & Flahault |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Nostoc commune var. fuscum Kützing |
| Identification made in | [no date] (2) |
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