| Name | Hygroamblystegium tenax subsp. orthocladon (P. Beauvois) Wijk & Margadant |
| Authorship | (P. Beauvois) Wijk & Margadant |
| Rank | Subspecies |
| Placed in | Hygroamblystegium tenax (Hedwig) Jennings |
| Citation | 1958 Taxon 7: 289 |
| Holdings | 90 Specimens held in the Harvard University Herbaria identified as Hygroamblystegium tenax subsp. orthocladon (P. Beauvois) Wijk & Margadant |
| Identification made in | [no date] (90) |