| Name | Monostroma orbiculatum f. varians Collins |
| Authorship | Collins |
| Rank | Forma |
| Placed in | Monostroma orbiculatum Thuret |
| Citation | 1909 Rhodora 11(122): 23-26 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Monostroma orbiculatum f. varians Collins |
| Identification made in | [no date] (1) |
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