| Name | Macromitrium williamsii E. B. Bartram |
| Authorship | E. B. Bartram |
| Rank | Species |
| NomenclaturalStatus | NomLeg |
| Placed in | Macromitrium |
| Citation | 1928 Contr. U.S. Natl. Herb. 26: 84 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Macromitrium williamsii E. B. Bartram |
| Identification made in | [no date] (1) |
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