| Name | Nostoc irregulare Wartmann |
| Authorship | Wartmann |
| Rank | Species |
| NomenclaturalStatus | NomInvalid |
| Placed in | Nostoc Vaucher ex Bornet & Flahault |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Nostoc irregulare Wartmann |
| Identification made in | [no date] (1) |
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