Ecology. Open and forested Chiquitano and Chaco, dry inter-Andean valleys, Tucuman-Bolivian montane, and puna; exposed or shaded habitats, typically found on soil and rocks. Elevation. 260-4905 m. Distribution. Bolivia: Chuquisaca, Cochabamba, La Paz, Potosí, Santa Cruz, Tarija. World range: rather widespread; common in the Andes and southeast Brazil.
Trichostomum brachydontium is characterized by the ligulate leaves to ca. 2.5 mm, acute to ± rounded apex with a stout, recurved mucro, basal cells differentiated across insertion, setae to 10 mm, cylindrical to ellipsoidal capsules to 1.5 mm, mostly reduced peristome; the recurved mucro is a good aid in differentiating other Trichostomum species in Bolivia.