Ecology: Puna, along stream and river banks or margin of bogs, on soil. Elevation: 3200-5200 m. Distribution: Endemic to the tropical Andes (Bolivia).
Ecología: Puna, sobre suelo mojado. Elevación: 3200-5200 m. Distribución: Endémica para Bolivia.
Bryum challaense is characterized by the white coloration of the plants, imbricate, ovate, broadly acuminate leaves, plane and entire margins, percurrent to shortly excurrent costa, subquadrate basal cells, and bulbous axillary gemmae. The more notable character emphasized by Ochi (1980) was the cordate leaf base, that aids in distinguishing this species from Brachymenium exile.