| Name | Sematophyllum pennellii R. S. Williams |
| Authorship | R. S. Williams |
| Rank | Species |
| NomenclaturalStatus | NomLeg |
| Placed in | Sematophyllum |
| Citation | 1925 Bryologist 28: 64 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Sematophyllum pennellii R. S. Williams |
| Identification made in | [no date] (2) |
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