| Name | Hymenostomum squarrosum Nees & Hornschuch |
| Authorship | Nees & Hornschuch |
| Rank | Species |
| Placed in | Hymenostomum |
| Citation | 1823 Bryol. Germ. 1: 193. 12 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Hymenostomum squarrosum Nees & Hornschuch |
| Identification made in | [no date] (1) |