BARNES — NORTH AMERICAN MOSSES. 317 



aggregated in a small sub-rosulate taft, erect-imbricate, spreading when 

 moist, small, oblong-acuminate, regularly concave; costa carinate, yellow- 

 ish, flexuous, excurrent into a short sharp point; margin strongly revolute, 

 bordered, quite entire; cells small, very regularly rhomboidal, empty: cap- 

 sule on a short (1.2 cm.) slender flexuous fuscous seta, minute, pyriform- 

 oval, narrow, fuscous, leptodermous; neck elongate (comparatively), very 

 slender, arcuate; lid minute, short conic and acutish from a convex base; 

 annulus broad, revoluble; teeth of peristome very narrow, yellowish, 

 median line none, margin scarcely cristate, prolonged into a sub-hyaline 

 filiform point; segments of endostome a little shorter, very slender, little 

 sulcate, neither gaping nor perforate, cilia single, equaling segments, re- 

 motely somewhat appendiculate. Flora 70: 220. 1887. — On hornblende 

 rocks: Chilcoot, Alaska. 



322. Bryum Sawyeri Ren. & Card. — Loosely or densely cespitose, 

 green or brownish: stems short, radiculose below, branching by several 

 innovations, more or less copiously provided in upper part with brown 

 thick simple articulate very caducous filaments arising from axils of 

 leaves; leaves regularly distant, or upper tufted, open when moist, erect 

 imbricate, often slightly twisted when dry, rather concave, oblong 

 sub-spatulate, narrowed at base, shortly acuminate, plane on borders, 

 obsoletely denticulate in upper part; costa percurrent or shortly excur- 

 rent; cells large, hexagonal, thin-walled, marginal cells elongated: seta 

 reddish, capsule brown or rufescent, pendent, finally oblique or subhor- 

 izO^ital, defiuent into a long attenuate neck, constricted below mouth 

 after fall of convex apiculate lid; teeth of peristome densely trabeculate; 

 segments split, cilia long, appendiculate: inflorescence seems to be 

 dioicous, male flowers unknown. Bot. Gaz. 14: 95. 1889. — On sandy 

 ground at base of trees or on decayed logs: Enterprise and Beauclerc, 

 Florida; Louisiana. 



323. Bryum extenuatum Ren. & Card. — In loose yellowish tufts: 

 stems depressed, radiculose, branching below perichsetium by elongated 

 innovations, erect, slender, flexuous, generally attenuate and flagelli- 

 form: stem leaves distant, equal, erect spreading when moist, imbricate 

 when dry, concave, from a long decurrent base ovate-lanceolate, shortly 

 acuminate-cuspidate, entire or sub-sinuate toward point; innovation leaves 

 much smaller and narrower; margins revolute from base to above middle, 

 costa excurrent into a very short point or vanishing just below apex; cells 

 rhomboidal or hexagonal, rectangular at bascj longer and narrower on 

 margin but not forming a distinct border: seta flexuous, reddish below, 

 yellowish above; capsule pendulous, narrowly cylindrical, constricted be- 

 low mouth when dry, tapering to a long attenuate neck; lid convex, acutely 

 apiculate; teeth pale yellow; internal membrane very broad, segments 



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