| Name | Polytrichastrum lyallii (Mitten) G. L. Smith |
| Authorship | (Mitten) G. L. Smith |
| Rank | Species |
| Placed in | Polytrichastrum |
| Citation | 1971 Mem. New York Bot. Gard. 21(3): 40. |
| Holdings | 37 Specimens held in the Harvard University Herbaria identified as Polytrichastrum lyallii (Mitten) G. L. Smith |
| Identification made in | [no date] (37) |
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