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, beloAv 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 : McMinn. (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 



Washington 



Westmoreland 



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



Linn and Simonton. (Porter's Catalogue). 



Shades, near Blackburn, March 25, 1910. 



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

 3. Pylaisia subdenticulata Bryologia Europaea. 



(Pylaisia denticulata Sullivant). 



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

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



