| Name | Polytrichadelphus lyallii Mitten |
| Authorship | Mitten |
| Rank | Species |
| Placed in | Polytrichadelphus |
| Holdings | 6 Specimens held in the Harvard University Herbaria identified as Polytrichadelphus lyallii Mitten |
| Identification made in | [no date] (5), 1951 (1) |
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