Torreya 15: 63. 1915,.
Protonema persistent as a thick green adherent felt. Leaves with strongly bordered and serrulate margins, distal laminal cell strongly bulging, papillae centered over lumens, mucro strongly denticulate. Capsule exothecial cells rectangular, 4–5: 1, mostly ca. 13–18 µm wide. Spores 18–20 µm, weakly ornamented.
Phenology: Capsules mature Apr.
Habitat: Usually under translucent rocks in exposed situations
Elevation: moderate elevations
Of conservation concern.
Aschisma kansanum is endemic to the United States, being restricted to High Plains grassland (Gary L. Smith 1990) in three counties in west-central Kansas. Its persistent protonema and habitat are distinctive. This tiny, very rare species is threatened by over-collecting and grazing.