| Name | Cosmarium tetragonum (Nägeli) W. Archer |
| Authorship | (Nägeli) W. Archer |
| Rank | Species |
| NomenclaturalStatus | Unknown |
| Placed in | Cosmarium |
| Contains | Cosmarium tetragonum var. bipapillatum (Eicher) Willi Krieger & Gerloff Cosmarium tetragonum var. davidsonii (J.Roy & Bisset) West & G.S.West Cosmarium tetragonum var. elegans (Roy & Bisset) West & G.S.West Cosmarium tetragonum var. euastroides Schaarschmidt Cosmarium tetragonum var. heterocrenatum West & G.S.West Cosmarium tetragonum var. intermedium Boldt Cosmarium tetragonum var. lundellii Cooke Cosmarium tetragonum var. ornatum Willi Krieger & Gerloff Cosmarium tetragonum f. schmidlei Gutwinski |
| Remarks | Created from Taxon Name Import: Cosmarium tetragonum (Nägeli) W. Archer |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Cosmarium tetragonum (Nägeli) W. Archer |
| Identification made in | [no date] (2) |
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