| Name | Cosmarium quadratum f. willei (Schmidle) West & G.S.West |
| Authorship | (Schmidle) West; G.S.West & 1908 |
| Rank | Forma |
| NomenclaturalStatus | Unknown |
| Placed in | Cosmarium quadratum Ralfs ex Ralfs |
| Remarks | Created from Taxon Name Import: Cosmarium quadratum f. willei (Schmidle) West & G.S.West, 1908 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Cosmarium quadratum f. willei (Schmidle) West & G.S.West |
| Identification made in | [no date] (1) |
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