OF WESTERN* PENNSYLVANIA 121 



Erie : On bark of Populns dcltoides, Presque Isle. 



September 20-22, 1906. O. E. J. 

 McKean : Langmade, Bradford. May 8, 1898. D. A. 



I). (Figured). 



4;7. Orthotrichum ohioense variety citrinum (Austin) Les- 



quereux and James. 



(O. citrinum Austin). 



Leaves dark green, narrowly lanceolate; capsule thin, 

 yellow. 



On bark of trees and with about the same range as the 

 species. Occurs in our region at Painesville, Ohio, and as 

 follows : 



Westmoreland: T. P. James. (Porter's Catalogue). 



5. Orthotrichum schimperi Hammar. 



Densely cespitose, dark green ; stems only a few mm. 

 high : leaves erect-spreading, lance-oblong, when dry im- 

 bricated and straight, obtuse to short-acuminate, margin re- 

 curved ; upper leaf-cells rounded-hexagonal, rather thin- walled 

 for the genus, relatively rather large, minutely papillose, the 

 basal cells larger, rectangular and smooth ; costa strong, end- 

 ing a little below the apex : seta very short, capsule immersed, 

 small, when moist oval-oblong with a distinct neck, when dry 

 narrower, constricted below the mouth, 8-plicate, yellowish to 

 orange: stomata immersed; exothecial cells quadrate to rec- 

 tangular-hexagonal, becoming at the mouth much smaller, 



o . 



rounded, and rather obscure ; peristome-teeth 8, bigemmate, 

 yellowish-pellucid, triangular-lanceolate, papillose, when dry 

 reflexed, the segments almost as long, lance-subulate, 8 in 

 number ; calyptra smooth, short, inflated, lustrous, with few 

 or no hairs, light yellow; spores .012-.015 rnm.. mature in 

 spring : autoicous. 



On trunks of trees ; Europe. Asia, Algeria, and. in North 

 America, in Vermont, Pennsylvania, District of Columbia. 

 Idaho, etc. Rare in our region. 



Washington : Linn and Simonton. (Porter's Cata- 



o 



logue). 



4. I' LOT A Mohr. 



Autoicous, rarely diocious : mostly forming cushions on 

 living trees : stems often creeping with erect or ascending 

 branches, radiculose ; leaves crisped or contorted when dry, 

 mostly spreading to squarrose, from a broadly concave base 

 lance-linear, carinate, with margins mostly revolute below; 

 costa percurrent or nearly so; basal cells narrowly linear, 

 yellowish but with a margin of one to several rows of hvaline, 



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