OF WESTERN PENNSYLVANIA 139 



thin, tortuous, twisted when dry ; capsule cernuous to almost 

 pendent, with a thin, long, somewhat arcuate, pyriform collum, 

 lustrous, narrow-mouthed; annulus narrow, deciduous; peri- 

 stome-teeth pale yellow, the upper part subulate and bordered ; 

 segments about as long, fenestrate, the lower third forming a 

 basal membrane, the cilia mostly long-appendiculate; spores of 

 medium size ; operculum small, convex, and mostly umbonate. 



A genus of three species ; one in Tasmania, one in Ecuador, 

 and the following, almost a cosmopolitan : 



1. Leptobryum pyriforme [Linnaeus] Wilson. 



( Wcbera pirifontiis Heclwig). 



(Plate XVII) 



Densely cespitose in light yellowish-green, soft, lustrous 

 tufts: stems .5-1.5 cm. high, slender, erect, reddish, brown- 

 radiculose at base ; leaves mostly erect-spreading, flexuous, the 

 upper forming a comal tuft, linear-setaceous, up to 4-5 mm., 

 long, the basal portion lanceolate, the upper portion flexuous, 

 with plane margin, denticulate above ; costa strong but rather 

 wide and indistinct, occupying most of the upper portion of 

 the leaf and somewhat excurrent ; leaf-cells narrow and linear- 

 prosenchymatous, or below elongate and parenchymatous, at 

 base rectangular and larger, all thin-walled ; perichastial bracts 

 linear from a wider base : seta slender, flexuous, orange to 

 brown, about 1-1.5 cm. long; capsule inclined to pendulous, 

 pyriform with a long narrow neck, altogether about 2.5 mm. 

 long, the neck much wrinkled when old, and at least as long 

 as the globose-oval part of the capsule, which is a lustrous 

 orange- to dark chestnut-brown, the mouth rather wide ; 

 annulus wide; peristome-teeth yellowish, linear-lanceolate, 

 the upper third suddenly narrower and sub-hyaline and papil- 

 lose, trabeculate, lamellae and divisural evident ; segments 

 about as long, carinately split and sometimes gaping; cilia 3, 

 strongly appendiculate, about as long as segments, basal mem- 

 brane one-third to almost one-half the height of the teeth; 

 operculum convex-apiculate : spores smoothish, about .012- 

 .015 mm.: usually synoicous : mature in June or July. 



On moist shaded soil, old walls, shaded cliffs and rocks 

 near trickling water, etc. Cosmopolitan. Rather common in 



our regon. 



Allegheny : On stone wall, Perrysville Avenue, Alle- 



gheny, May 26, 1909 (Figured) ; on 

 cliffs along roadside, Stoop's Ferry, May 

 17, 1907; on decayed logs, Schenley 

 Park, Pittsburgh, August 26, 1906. O. E. 

 I. ; in Ferguson's greenhouse, Allegheny, 

 April 30, 1889. J. A. S. 



