Ecology. Dry inter-Andean valleys, open Yungas and Tucuman-Bolivian montane, semi-humid and humid puna; on soil and rock. Elevation. 1800-4420 m. Distribution. Bolivia: Chuquisaca, Cochabamba, La Paz, Oruro, Potosí, Santa Cruz, Tarija. World range: southwest United States, Mexico and tropical Andes (Peru, Bolivia).
Syntrichia obtusissima is characterized by the presence of a central strand, spathulate to linguate leaves to 4 mm, typically emarginated apices (infrequently truncate), recurved leaf margins from base to below midleaf, unistratose lamina, yellowish or brown, long excurrent costa papillose on dorsal surface, and spinose, long hair point (leaf lamina ca. 1-2 x longer hair point), and absence of hydroids (viewed in cross-section).