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Pterygoneurum subsessile var. kieneri Hab.  
Family: Pottiaceae
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Richard H. Zander in Flora of North America (vol. 27)
Capsule facultatively cleisto-carpous: annulus differentiated but operculum remains attached, spores released through ruptured capsule walls.

Capsules mature Jul. Grassland soil; moderate elevations (950 m); Nebr.

Variety kieneri has possibly hybrid sporophytes. Two forms with identical gametophytes were present in the type collection, one with typical sporophyte, the other with that of the variety. The operculum is not dehiscent and the capsule bursts irregularly. The sporophyte apparently falls as a unit, breaking off at the base of the seta. The single collection is from Nebraska, Chase County, 12.5 km west of Champion, W. Kiener 10627 (MO).
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This project was made possible in part by the Institute of Museum and Library Services [MG-70-19-0057-19].
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