| Name | Leptodictyum riparium f. obtusum (Grout) Grout |
| Authorship | (Grout) Grout |
| Rank | Forma |
| Placed in | Leptodictyum riparium (Hedwig) Warnstorf |
| Citation | 1931 Moss Fl. N. Amer. 3: 65. |
| Holdings | 5 Specimens held in the Harvard University Herbaria identified as Leptodictyum riparium f. obtusum (Grout) Grout |
| Identification made in | [no date] (5) |