| Name | Hypnum laetum Bridel | 
| Authorship | Bridel | 
| Rank | Species | 
| Placed in | Hypnum Hedwig | 
| Citation | 1827 Bryol. Univ. 2: 479–480 | 
| Holdings | 19 Specimens held in the Harvard University Herbaria identified as Hypnum laetum Bridel | 
| Identification made in | [no date] (19) |