| 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) |