⚠ Version 1 of The Plant List has been superseded.
This name record (from Tropicos) is not included in version 1.1 of The Plant List. It is possible the same name is included from a different data source, to check this you can search for Trichostomum rigidulum in version 1.1 of The Plant List.
This name is a synonym of Didymodon rigidulus var. densus .
The record derives from Tropicos which reports it as a synonym (record 35179735
) with original publication details: Bryol. Eur. 2: 128. 176b (fasc. 18--20 Mon. 10. 7b) 128 1843.