| Name | Cosmarium quadrangulatum Hantzsch |
| Authorship | Hantzsch |
| Rank | Species |
| NomenclaturalStatus | Unknown |
| Placed in | Cosmarium |
| Remarks | Created from Taxon Name Import: Cosmarium quadrangulatum Hantzsch |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Cosmarium quadrangulatum Hantzsch |
| Identification made in | [no date] (1) |
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