| Name | Cosmarium polygonum (Nägeli) W. Archer |
| Authorship | (Nägeli) W. Archer |
| Rank | Species |
| NomenclaturalStatus | Unknown |
| Placed in | Cosmarium |
| Contains | Cosmarium polygonum var. acutius Messikommer Cosmarium polygonum var. depressum Messikommer Cosmarium polygonum var. hexagonum Grönblad |
| Remarks | Created from Taxon Name Import: Cosmarium polygonum (Nägeli) W. Archer |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Cosmarium polygonum (Nägeli) W. Archer |
| Identification made in | [no date] (1) |
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