| Name | Leptodictyum riparium f. longifolium (Schultz) Grout |
| Authorship | (Schultz) Grout |
| Rank | Forma |
| Placed in | Leptodictyum riparium (Hedwig) Warnstorf |
| Citation | 1935 Moss Fl. N. Amer. 3: 65 |
| Holdings | 35 Specimens held in the Harvard University Herbaria identified as Leptodictyum riparium f. longifolium (Schultz) Grout |
| Identification made in | [no date] (35) |
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