| Name | Drepanocladus aduncus f. paternus (Sanio) Grout |
| Authorship | (Sanio) Grout |
| Rank | Forma |
| Placed in | Drepanocladus aduncus (Hedwig) Warnstorf |
| Citation | 1931 Moss Fl. N. Amer. 3: 111 |
| Holdings | 9 Specimens held in the Harvard University Herbaria identified as Drepanocladus aduncus f. paternus (Sanio) Grout |
| Identification made in | [no date] (9) |