OF WESTERN PENNSYLVANIA 231 



cidedly curved or hooked at the end ; leaves close, imbricate 

 at the base, prominently falcate-secund, especially so when 

 dry, lance-ovate, about 0.7-1.0 mm. long by about one-third 

 as wide, rather long-acuminate, sub-serrate to entire, rounded 

 at the base, concave, the margin plane and non-bordered ; 

 median leaf-cells about 6-10:1, usually .003-004 mm. wide, 

 linear-prosenchymatous, the apical shorter and wider, the alar 

 distinct, numerous, quadrate to transversely rectangular, yel- 

 lowish-incrassate, forming a triangular group extending up 

 along the leaf-margin to one-third the length of the leaf; 

 perichaetial leaves similar but longer, up to 2.5 mm., and more 

 slenderly acuminate : seta about 1.5 cm. long, lustrous, red- 

 castaneous, dextrorse above ; capsule ovoid-oblong, castaneous, 

 about 2 mm. long, about 2.5:1, erect, symmetric, small- 

 mouthed; peristome-teeth narrowly triangular lanceolate, 

 closely trabeculate, the dorsal lamellae narrow, numerous, 

 finely cross-striate, pale yellow, bordered up to two-thirds or 

 three-fourths by the linear, adherent, hyaline and somewhat 

 papillose segments, which are usually united at the tip but 

 widely split below ; cilia none ; basal membrane very narrow 

 or none ; annulus 2-3-seriate, narrow ; exothecial cells yellow- 

 ish, somewhat incrassate, irregularly rounded-hexagonal to 

 oblong-rhomboidal, below the annulus several series being 

 much smaller and transversely rhomboid-oblong ; lid about 0.5 

 mm. high, conic-obtuse, often somewhat oblique ; spores dense- 

 ly chlorophyllose, densely incrassate, castaneous-pellucid, 

 papillose, about .018-025 mm., mature in September or Oc- 

 tober. 



Allegheny : Power's Run, September 21, 1905. O. 

 E.J. 



Clearfield : Phillipsburg. T. P. James. (Porter's 



Catalogue). 



Elk : Mcilinn. (Porter's Catalogue). 



Indiana : Blairsville. T. P. James. (Porter's Cata- 



logue) . 



Fayette : Ohio Pyle, September 1-3, 1906. O. E. 



J. and G. K. J. (Figured). 



Lawrence : Gorge below Ellwood City, June 26, 1909. 



O. E. J. 



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



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



Westmoreland: Shades, near Blackburn, March 25, 1910. 

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



3. Pylaisia subdenticulata Bryologia Europsea. 

 (Pylaisia denticulata Sullivant). 

 Intricately cespitose, glossy, yellow-green: stems creep- 

 ing with erect or ascending branches about 5-6 mm. long;; 



