| Name | Grimmia affinis Hornschuch |
| Authorship | Hornschuch |
| Rank | Species |
| Placed in | Grimmia |
| Citation | 1819 Bot. Zeitung (Regensburg) 2: 85 |
| Holdings | 36 Specimens held in the Harvard University Herbaria identified as Grimmia affinis Hornschuch |
| Identification made in | [no date] (36) |
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