Plants elliptic to globose, occasionally three-angled, 1–1.5 mm. Stem leaves awned, broadly channeled; laminal cells papillose abaxially. Seta as long as the diameter of the capsule. Spores spheric, 35-40 µm, papillose.
Phenology: Capsules mature winter.
Habitat: Soil, dry washes
Elevation: low to moderate elevations
Ariz., Ill., Iowa, Kans., Tex., Mexico (Nuevo León).
Acaulon schimperianum is awned and the distal margins are more strongly dentate than those of the other species.