Jennings: Manual of Mosses — 31. Hypnaceae 257 



rate, undulately strongly dentate all around, the teeth sometimes recurved, no 

 papillae on back of leaf; branch-leaves more ovate and smaller; costa double 

 and strong, reaching to about mid-leaf; median leaf-cells about 8-10:1, linear, 

 not forming distinct auricles, the extreme basal castaneous-incrassate, rounded; 

 perichaetial leaves broad, apically spreading: seta slender, 3-4 cm long, flexu- 

 cus; capsule short, about 2:1, turgid-ovate, more or less horizontally inclined, 

 somewhat plicate and constricted below the mouth when dry and empty; peri- 

 stome normally hypnoid, segments carinately split, the cilia usually 2, about 

 as long as segments; annulus none; lid conic, shortly apiculate; spores mature 

 in winter or early spring. 



Over rocks, logs, and woods-humus, in cool mountain woods and ravines; 

 Europe, Asia, and, in North America, from Newfoundland to Alaska south 

 to Ohio, and southwards in the mountains to North Carolina. 



Rare in our region. McKean Co.: In deep, densely shaded ravines, altitude 1700 

 feet along Marilla Brook one-half mile above Bradford, April 21, 1879. D.A.B. (fig- 

 ured ) . 



3. Hylocomium brevirostre [Ehrhart] Bryologia Europaea 



{Hypnum brevirostre Ehrhart; H. interruptum Bridel ) 

 Plate XLVIII 



Robust, rigid, forming large, swollen tufts of a dark but glossy yellow-green: 

 stems much-divided, up to 12-15 cm long, erect to arched-procumbent, irregu- 

 larly pinnately branched, the branches unequal, attenuate, not complanately 

 arranged, but bushy, paraphyllia rather small, branched, stems reddish-brown; 

 stem-leaves somewhat crowded, spreading to squarrose, about 2-4 mm long, 

 cordate-ovate to triangular-ovate, abruptly narrowed to a rather long channeled 

 acumen, the base notably with large rounded, sub-clasping, and somewhat 

 decurrent auricles, the margins finely and regularly denticulate, the leaves when 

 dry much plicate: branch-leaves smaller, narrower, more ovate, less squarrose; 

 perichaetial leaves sheathing at base, subulate-acuminate, squarrose, apical'y 

 serrate; costa of stem- and branch-leaves double and reaching to about one- 

 third the length of the leaf; median leaf-cells linear, about 5-8:1, rather incras- 

 sate, basal cells shorter and wider, colored, with pitted walls, the alar not 

 differentiated: seta flexuous, about 2 cm long, dextrorse and arcuate above, 

 castaneous; capsule turgidly ovoid-oblong, horizontally inclined, the urn about 

 2 mm long, castaneous, arcuate and constricted below the mouth when dry; 

 lid conic-acuminate, about 1 mm long; annulus usually 2-seriate, rather wide; 

 peristome hypnoid, teeth orange-yellow, dorsally lamellate, cross-striolate 

 below, papillose above, moderately trabeculate, confluent and inserted at base; 

 segments slender, about as long at teeth, yellowish, carinately gaping, finely 

 spinose-papillose above, the basal membrane about two-fifths as high; cilia 

 usually short, nodose-appendiculate; exothecial cells laterally strongly cas- 

 taneous-incrassate, rounded-hexagonal to rounded-rectangular; spores about 

 .021 -.024 mm, oblong to round, castaneous, moderately incrassate, somewhat 

 papillose, mature in winter or early spring. 



In cool, deep, shaded ravines and in swamps on soil, rocks, or at the bases 



