| Name | Ephemerum serratum var. minutissimum (Lindberg) Grout |
| Authorship | (Lindberg) Grout |
| Rank | Variety |
| Placed in | Ephemerum serratum (Schreber ex Hedwig) Hampe |
| Citation | 1935 Moss Fl. N. Amer. 2: 68. |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Ephemerum serratum var. minutissimum (Lindberg) Grout |
| Identification made in | [no date] (1) |