Ecology. Puna; on rocks. Elevation. 4150-4650 m. Distribution. Bolivia: La Paz. World range: widespread.
Didymodon asperifolius is characterized by the reddish-brown or orange-green coloration, rather large statured plants to 3 cm, absence of a central strand, ovate-lanceolate leaves to 2.5 mm, plane, when wet leaves squarrose, narrow to broad acute apices, not decurrent, unistratose lamina, revolute margins (lower 2/3 the leaf length), subpercurrent to percurrent costa, quadrate to short rectangular upper adaxial costal (epidermal) cells, smooth to low unipapillose, subquadrate-rounded to transversely short oblong distal cells, and thick-walled rectangular cells.
Specimens. La Paz: Lewis 87-604 (MO), 88-800 (LPB, MO); all det. J.A. Jiménez.