| Name | Hypnum arcticum Sommerfelt |
| Authorship | Sommerfelt |
| Rank | Species |
| Placed in | Hypnum Hedwig |
| Citation | 1826 Fl. Lapp. (Wahlenberg) 65. 2. |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Hypnum arcticum Sommerfelt |
| Identification made in | [no date] (1) |
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