| Name | Plagiothecium laetum f. tenellum (Schimper) Mönkemeyer | 
| Authorship | (Schimper) Mönkemeyer | 
| Rank | Forma | 
| Placed in | Plagiothecium laetum Schimper | 
| Citation | 1927 Laubm. Eur. (Monkemeyer) 861 | 
| Holdings | 3 Specimens held in the Harvard University Herbaria identified as Plagiothecium laetum f. tenellum (Schimper) Mönkemeyer | 
| Identification made in | [no date] (3) |