Jennings: Manual of Mosses — 14. Bryaceae 131 



blow, tufted above, ovate below to ovate- or linear-lanceolate above, non-de- 

 current to sub-decurrent, erect-spreading, when dry more or less shrunken, 

 twisted, and appressed, reddish at base, margins recurved, apex obscurely den- 

 ticulate, cuspidate-acuminate; costa strong, reddish, long-excurrent; leaf-cells 

 rhomboid to elongate, thin-wal!ed and rectangular at base, the border wide 

 and formed of several rows of linear-prosenchymatous incrassite yellowish 

 cells: seta erect, slender, flexuous, lustrous-castaneous, in our specimens about 

 2 cm long: capsule oblong-pyriform, about two fifths neck, horizontal to sub- 

 pendulous, contracted below the mouth when dry, brown; annulus wide, revol- 

 uble; lid conic-apiculate; teeth of the peristome yellowish-pellucid, towards 

 apex sub-hyaline and papillose, linear-triangular, strongly trabeculate, lamellae 

 and divisural rather indistinct; segments of inner peristome slightly shorter, 

 carinately split, cilia 3, stronqly appendiculate, slightly shorter than segments, 

 basal membrane one-half height of teeth; spores yellowish-pellucid, smoothish 

 or minutely roughened, about .014-016 mm; exothecial cells incrassate, rectangu- 

 larly quadrate or hexagonal, the upper three or four rows much smaller and 

 rounded to transversely elongate and darkly reddish-pellucid: gonioautoicous, 

 — antheridia in apex of the lateral innovations: mature in May or June. 



In crevices of walls and sandstone rocks. Europe, Asia, northern Africa, 

 North America from Greenland to British Columbia and south to the northern 

 United States, Ohio and New York. 



Rare in our region. Allegheny Co.: On debris in rock-crevices along sandstone clifF 

 facing the Allegheny River at Power's Run, April 28, 1907. O.E.J, (figured). 



6. Bryum caespiticium [Linnaeus] Hedwig 



Plate XXIV 

 Densely cespitose, yellowish-green: stems erect, rarely more than 1 cm high 

 with us, branching by lateral innovations, brownish-tomentose below, reddish 

 above; leaves remote and small below, the upper densely tufted, ovate to 

 lanceolate or narrower within, concave, narrowly acuminate, borders recurved, 

 the apex slightly denticulate or sometimes entire, the base often reddish, the 

 comal reaching 3-3.5 x 1 mm, when dry but little shrunken or twisted; costa 

 strong, reddish, long-excurrent; leaf-cells narrow-rhomboid, becoming larger 

 and rectangular at base, the marginal in one to three rows of linear-prosen- 

 chymatous incrassate cells but not forming a very pronounced border; seta 

 erect, slender, flexuous, lustrous-castaneous, about 2-4 cm long, rarely more; 

 capsule oblong-pyriform, 3-3.5 mm long, yellowish-brown to darker with age, 

 the neck comprising almost one-half the capsule, horizontal to pendulous, 

 sometimes unsymmetrically up-curved, constricted below the mouth when dry 

 and empty: the mouth darker colored; peristome-teeth yellowish-pellucid below, 

 paler and minutely papillose above, linear-lanceolate; segments of inner peri- 

 stome almost as long, somewhat yellowish, carinately split and gaping, cilia as 

 long as segments or almost so, strongly appendiculate, basal membrane about 

 two- fifths the height of teeth; spores about .012-017 mm, smoothish, yellowish- 

 pellucid; exothecial cells incrassate, rectangular below to irregularly quadrate- 

 hexagonal above, the upper three or four rows much smaller and rounded- 

 quadrate to laterally elongate and colored; operculum usually orange-brownish, 



