t)F WESTERN PENNSYLVANIA 229 



woods, Keown, November 14, 1909. O. 



E. J. (Figured). 

 Armstrong : Kittanning, September 24, 1904. O. E. J. 



and October 21, 1905. O. E. J. 

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



Butler : Near Crider's Corners, December 29, 1908. 



O. E. J. 

 Crawford : Bark of Chestnut tree, Linesville. May 12, 



1908. O. E. J. 

 Greene : Waynesburg, October 17, 1905. O. E, J. 



Fayette : Four miles south of Ohio Pyle, Morris 



Farm, September 1-3, 1906. O. E. J. 



and G. K. J. 

 McKean : Bradford. D. A. B. (Porter's Catalogue). 



Washington : Linn and Simonton. (Porter's Catalogue) ; 



Hanlin, on base of Juglans nigra. May 21, 



1908, and on log. Library, Pa., April 22, 



1906. O. E. J. 

 Westmoreland: On bark of dead tree Laurel Hill Mts., 



Mellon's estate, September 8-11, 1907. O. 



E. J.; Shades, near Blackburn, March 25, 



1910. O. E. J. and G. K. J. 



4. PYLAISA Bryologia Europtea. 

 (Pylaisiella Kindberg). 



Autoicous ; slendfer to rather robust, lustrous, in flat tufts : 

 stem creeping, long, unsymmetrically pinnate ; branches short, 

 ascending to erect, often curved, in cross section appearing ap- 

 pressed ; leaves homogeneous, more or less imbricate, when 

 moist erect-spreading, often secund, somewhat decurrent, con- 

 cave, non-plicate, ovate to lance-oval, more or less long-acumi- 

 nate, mostly plane and entire ; costa double, very short or 

 none; leaf-cells linear-rhombic, smooth, alar numerous, quad- 

 rate : seta 1-2 cm. long, castaneous, drying twisted, smooth ; 

 capsule erect, symmetric, rarely somewhat curved, oval to ob- 

 long-cylindric, collum short ; annulus small-celled or none ; 

 peristome deeply inserted ; teeth lance-subulate, at the apex 

 often irregular and sometimes remaining in the lid or attached 

 to the segments, yellowish, hyaline-bordered, striate, densely 

 articulate and trabeculate ; basal membrane low, segments 

 narrowly lance-subulate, as long as the teeth or shorter, some- 

 times two-cleft, the divisions remaining attached to the teeth ; 

 cilia mostly rudimentary ; spores small to large ; lid conic to 

 rostrate. 



Thirty-seven species, mainly on trees, in temperate re- 

 gions; 11 species in North America, probably four species in 

 our region. 



