| Name | Hylocomium splendens subsp. giganteum Persson ex Vitt |
| Authorship | Persson ex Vitt |
| Rank | Subspecies |
| Placed in | Hylocomium splendens (Hedwig) Schimper |
| Citation | 1983 Lindbergia 9: 15 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Hylocomium splendens subsp. giganteum Persson ex Vitt |
| Identification made in | [no date] (2) |