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FNA | Family List | FNA Vol. 27 | Pottiaceae | Aschisma

1. Aschisma kansanum A. L. Andrews, 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.

Capsules mature Apr. Usually under translucent rocks in exposed situations; moderate elevations; of conservation concern; Kans.

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.


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