| Name | Sphagnum platyphyllum var. laxifolium Warnstorf |
| Authorship | Warnstorf |
| Rank | Variety |
| NomenclaturalStatus | LaterHomonym |
| Placed in | Sphagnum platyphyllum (Lindberg ex Braithwaite) Warnstorf |
| Citation | 1911 Pflanzenr. [Engler] 51: 380 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Sphagnum platyphyllum var. laxifolium Warnstorf |
| Identification made in | [no date] (1) |