| Name | Megalastrum umbrinum (C. Christensen) A. R. Smith & R. C. Moran |
| Authorship | (C. Christensen) A. R. Smith & R. C. Moran |
| Rank | Species |
| Placed in | Megalastrum |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Megalastrum umbrinum (C. Christensen) A. R. Smith & R. C. Moran |
| Identification made in | 2018 (1) |