Jennings: Manual of Mosses — 14. Bryaceae 133 



Known from the following counties: Allegheny, Butler, Cambria, Centre, Crawford, 

 Erie, Fayette, Indiana (Porter), McKean, and Washington. Specimens figured: Flinton, 

 July 23, 1908, and St. Lawrence, Cambria Co., July 24, 1908. 



9. Bryum bicolor Dickson 



(Bryum atTopuipureum Authors, not Weber and Mohr) 



Gregarious, low, dark green; stems erect, reddish; leaves compact, im- 

 bricate when dry, the upper larger, concave, ovate-acuminate, entire, non- 

 decurrent; costa usually excurrent in the comal leaves; cells rhomboidal, rather 

 thick-walled, not forminp a distinct border; dioicous; seta short, about 1 cm, 

 dark purplish red; capsule pendulous, small, 2 3 mm long, shortly oblong to 

 obovate, passing quickly into the seta, when ripe dark red; operculum wide, low 

 conic, apiculate, shining, red; peristome teeth castaneous, strong, rather abrupt- 

 ly long acuminate, papillose; segments papillose pale yellow, with high basal 

 membrane; cilia appendiculate; spores described as small, about .010 mm in 

 diameter, ripening in late spring or early summer. 



Said, to occur on moist clay or sandy ground. Northern part of the Old 

 World and in North America from southern Canada to the Gulf States and 

 California. Not yet reported from our region. 



10. Bryum argenteum [Linnaeus] Hedwig 



Plate XXIV 



More or less densely cespitose, more or less whitish and silvery green: 

 stems short, rndiculose, with numerous lateral innovations; leaves closely im- 

 bricated, deeply concave and so numerous that the branches are terete and 

 julaceous, leaves small, about 1 mm long, widely ovate or obovate, slightly or 

 no'; at all decurrent, margins plane, entire, acute to long-acuminate, when dry 

 silvery shininp and hardly altered in shape; costa thin, wide, disappearing in 

 upper third of leaf; leaf-cells rhomboid-hexagonal above, below rectangular, all 

 somewhat pellucid and incrassate, the lower half of the leaf more or less chloro- 

 phyllose, the upper half colorless: seta s'ender, lustrous, usually chestnut- 

 colored below, pale above, often dark when old, flexuous, 1-1.5 cm long; cap- 

 sule about 1.5-2 mm long, oblong, the neck short and hardly tapering, by a 

 quick turn at the apex of the seta pendent and often touching the seta at its 

 wider part, somewhat constricted below the rr.outh when dry and empty, dark 

 brown when old; annulus wide, revoluble; peristome-teeth linear lanceolate, 

 yellowish-pellucid, hyaline at ap>ex, trabeculate, lamellate, divisural zigzag; seg- 

 ments nearly as long, carinately split and gaping, faintly yellowish-pellucid, 

 cilia as long as segments, three in number, appendiculate, basal membrane half 

 ar high as teeth; exothecial cells quadrate to hexagonal, densely incrassate and 

 orange-pellucid, the upper eight to ten rows smaller, less densely incrassate, 

 rounded-quadrate to laterally elongate; operculum convex, apiculate, orange; 

 spores .010-.014 mm, smoothish, yellowish-pellucid: dioicous: mature mostly 

 from October to November. 



Cosmopolitan, comm.cn on dry earth, crevices of brick or stone pavements 

 and walls, soil-covered rocks, etc 



