| Name | Pterigynandrum filiforme f. papillosulum (Muller Halle & Kindberg) Grout |
| Authorship | (Muller Halle & Kindberg) Grout |
| Rank | Forma |
| Placed in | Pterigynandrum filiforme Hedwig |
| Citation | 1934 Moss Fl. N. Amer. 3: 197 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Pterigynandrum filiforme f. papillosulum (Muller Halle & Kindberg) Grout |
| Identification made in | [no date] (1) |
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