OF WESTERN PEXXSYLVAX 1 A. 47 



capsule oval, opening- usually by four perpendicular slits along 

 the sides but remaining united at apex and base; columella 

 persistent; spores smoothish, mature in late spring. 



Cosmopolitan in mountainous or hilly regions on non- 

 calcareous exposed or dry rocks. In Xorth America from the 

 Arctic regions south to northern United States. Occurs in 

 northeastern Pennsylvania and in northern \Yest Virginia. 



