| 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) |