| Name | Cosmarium arctoum Nordstedt |
| Authorship | Nordstedt |
| Rank | Species |
| NomenclaturalStatus | Unknown |
| Placed in | Cosmarium |
| Contains | Cosmarium arctoum var. constrictum Grönblad & A. M. Scott Cosmarium arctoum f. minus West Cosmarium arctoum var. tatricum Raciborski |
| Remarks | Created from Taxon Name Import: Cosmarium arctoum Nordstedt |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Cosmarium arctoum Nordstedt |
| Identification made in | [no date] (2) |
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