| Name | Cosmarium quadratum Ralfs ex Ralfs |
| Authorship | Ralfs ex Ralfs |
| Rank | Species |
| NomenclaturalStatus | Unknown |
| Placed in | Cosmarium |
| Contains | Cosmarium quadratum var. angustatum West & G.S.West Cosmarium quadratum f. boreale Croasdale Cosmarium quadratum f. maius Manguin Cosmarium quadratum f. major Nordstedt Cosmarium quadratum var. quadratum Ralfs ex Ralfs Cosmarium quadratum f. willei (Schmidle) West & G.S.West Cosmarium quadratum var. willei (Schmidle) Willi Krieger & Gerloff |
| Remarks | Created from Taxon Name Import: Cosmarium quadratum Ralfs ex Ralfs |
| Holdings | 5 Specimens held in the Harvard University Herbaria identified as Cosmarium quadratum Ralfs ex Ralfs |
| Identification made in | [no date] (5) |
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