| Name | Hymenophyllum longifolium Alderwerelt |
| Authorship | Alderwerelt |
| Rank | Species |
| Placed in | Hymenophyllum Smith |
| Citation | 1914 Bull. Jard. Bot. Buitenzorg ser. 2, 16: 17 |
| Holdings | 11 Specimens held in the Harvard University Herbaria identified as Hymenophyllum longifolium Alderwerelt |
| Identification made in | [no date] (8), 1999 (3) |