| Name | Cosmarium isthmium West |
| Authorship | West |
| Rank | Species |
| NomenclaturalStatus | Unknown |
| Placed in | Cosmarium |
| Contains | Cosmarium isthmium f. hibernicum West Cosmarium isthmium var. horizontale Schmidle |
| Remarks | Created from Taxon Name Import: Cosmarium isthmium West |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Cosmarium isthmium West |
| Identification made in | [no date] (2) |
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