| Name | Hygroamblystegium irriguum f. marianopolitanum Dupret |
| Authorship | Dupret |
| Rank | Forma |
| Placed in | Hygroamblystegium irriguum (Hooker & Wilson) Loeske |
| Citation | 1931 Moss Fl. N. Amer. 3: 73. |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Hygroamblystegium irriguum f. marianopolitanum Dupret |
| Identification made in | [no date] (1) |