| Name | Drepanocladus aduncus f. aquaticus (Sanio) Mönkemeyer |
| Authorship | (Sanio) Mönkemeyer |
| Rank | Forma |
| Placed in | Drepanocladus aduncus (Hedwig) Warnstorf |
| Citation | 1931 Moss Fl. N. Amer. 3: 109 |
| Holdings | 20 Specimens held in the Harvard University Herbaria identified as Drepanocladus aduncus f. aquaticus (Sanio) Mönkemeyer |
| Identification made in | [no date] (20) |