| Name | Hymenophyllum firmum Alderwerelt |
| Authorship | Alderwerelt |
| Rank | Species |
| Placed in | Hymenophyllum Smith |
| Citation | 1924 Nova Guinea 14: 28 |
| Holdings | 28 Specimens held in the Harvard University Herbaria identified as Hymenophyllum firmum Alderwerelt |
| Identification made in | [no date] (7), 1999 (21) |
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