OF WESTERN PENNSYLVANIA 151 



oblong-pyriform, with a tapering neck a little shorter than the 

 rest of the capsule, yellowish-brown, finally deep brown, when 

 dry and empty constricted below the deeper-colored mouth, 

 more or less pendulous ; operculum wide, convex-mamillate ; 

 annulus wide, revoluble ; peristome-teeth linear-triangular, 

 yellowish-pellucid below, sub-hyaline and papillose above, 

 strongly trabeculate, lamellate, the zig-zag divisural usually 

 faint; basal membrane of inner peristome about half the length 

 of the teeth, the segments carinately split, hyaline and papil- 

 lose, a little shorter than the teeth, the three filiform ap- 

 pendiculate cilia somewhat shorter than the segments ; spores 

 yellowish-pellucid, minutely roughened, usually about .010- 

 .014 mm. ; exothecial cells irregularly quadrate to rectangular- 

 hexagonal, incrassate, three or four rows below the mouth be- 

 ing much smaller, rounded-quadrate and reddish-pellucid ; 

 synoicous : spores mature in summer. 



Allegheity : Sewickley. May 21, 1889, T. A. S. ; Power's 



Run, May 4, 1905. O. E. J. and G. E. K. ; 



Stoop's Ferry, Alay 20, 1907. O. E. J. 



and G. K. J, 



Erie : Presque Isle, :\Iay 8-9, 1906. O. E. J. 



(Figured). 

 Fayette : Laurelville, June 24, 1904. O. E. J. 



Lawrence : Stop 78, S. and N. C. W. R. R., 1906. .Miss 



Susan Gageby; Gorge below Ellwood 

 City, June 26, 1909. O. E. J. 

 Somerset : Ursina, May 12, 1905. O. E. J. 



Westmoreland: Derry, August 10, 1904. Miss Katherine 

 R. Holmes; Hillside, May 19, 1906. O. 

 E.J. 

 5. Bryum intermedium [Ludwig] Bridel. 

 {Milium uiicrmediiivi Ludwig; Wehera intermedia Schwaeg- 

 richen). 



(Plate XIX) 

 Densely cespitose, green, matted with dark-colored 

 radicles : stems short, laterally branching by innovations, erect 

 and with us usually about 3-5 mm. high ; leaves tufted at apex 

 of stem, erect-spreading, concave, oblong- to ovate-lanceolate, 

 the margins recurved, almost entire, base sometimes reddish, 

 only slightly decurrent, in otu" specimens about L5-2 mm. 

 long, the costa excurrent into a long entire or denticulate 

 acumen : leaf-cells rhomboidal above, thin-walled and rectangu- 

 lar at base, the marginal in one to three series of linear- 

 prosenchymatous cells forming a somewhat indistinct border, 

 sometimes the middle cells merely narrow gradually towards 

 the margin: seta in our specimens 1.5-3.0 cm. long, flexuous, 

 slender, lustrous, castaneous; capsule about 3 mm. long, ellip- 



