| Name | Amblystegium varium f. laxum Grout |
| Authorship | Grout |
| Rank | Forma |
| NomenclaturalStatus | NomLeg |
| Placed in | Amblystegium varium (Hedwig) Lindberg |
| Citation | 1931 Moss Fl. N. Amer. 3, pt. 2: 70 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Amblystegium varium f. laxum Grout |
| Identification made in | [no date] (1) |