| Name | Ptychomitrium drummondii (Wilson) Sullivant |
| Authorship | (Wilson) Sullivant |
| Rank | Species |
| Placed in | Ptychomitrium |
| Citation | 1856 Manual [A. Gray], ed. 2. 636 |
| Holdings | 42 Specimens held in the Harvard University Herbaria identified as Ptychomitrium drummondii (Wilson) Sullivant |
| Identification made in | [no date] (41), 1967 (1) |