| Name | Cosmarium hammeri var. protuberans West & G.S.West |
| Authorship | West & G. S. West |
| Rank | Variety |
| NomenclaturalStatus | Unknown |
| Placed in | Cosmarium hammeri Reinsch |
| Remarks | Created from Taxon Name Import: Cosmarium hammeri var. protuberans West & G.S.West |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Cosmarium hammeri var. protuberans West & G.S.West |
| Identification made in | [no date] (1) |
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