| Name | Leptodictyum riparium subsp. sipho (P. Beauvois) Grout |
| Authorship | (P. Beauvois) Grout |
| Rank | Subspecies |
| Placed in | Leptodictyum riparium (Hedwig) Warnstorf |
| Citation | 1931 Moss Fl. N. Amer. 3: 66 |
| Holdings | 6 Specimens held in the Harvard University Herbaria identified as Leptodictyum riparium subsp. sipho (P. Beauvois) Grout |
| Identification made in | [no date] (6) |
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