| Name | Ptychomitrium gardneri Lesquereux |
| Authorship | Lesquereux |
| Rank | Species |
| Placed in | Ptychomitrium |
| Citation | 1868 Mem. Calif. Acad. Sci. 1: 16 |
| Holdings | 27 Specimens held in the Harvard University Herbaria identified as Ptychomitrium gardneri Lesquereux |
| Identification made in | [no date] (25), 1968 (2) |