| Name | Taxithelium portoricense R. S. Williams |
| Authorship | R. S. Williams |
| Rank | Species |
| NomenclaturalStatus | NomLeg |
| Placed in | Taxithelium |
| Citation | 1927 Bryologist 30: 37 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Taxithelium portoricense R. S. Williams |
| Identification made in | [no date] (2) |