| Name | Macromitrium flavopilosum R. S. Williams |
| Authorship | R. S. Williams |
| Rank | Species |
| NomenclaturalStatus | NomLeg |
| Placed in | Macromitrium |
| Citation | 1911 Bull. Torrey Bot. Club 38: 34 |
| Holdings | 3 Specimens held in the Harvard University Herbaria identified as Macromitrium flavopilosum R. S. Williams |
| Identification made in | [no date] (1), 1992 (1), 2013 (1) |