| Name | Plagiothecium mariannae Grout |
| Authorship | Grout |
| Rank | Species |
| NomenclaturalStatus | NomLeg |
| Placed in | Plagiothecium |
| Citation | 1940 Moss Fl. N. Amer. 2: 272 |
| Holdings | 4 Specimens held in the Harvard University Herbaria identified as Plagiothecium mariannae Grout |
| Identification made in | [no date] (1), 1985 (1), 2019 (2) |
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