294 BULLETIN OP THE UNIVERSITY OF WISCONSIN. 



ones; costa slender, vanishing below apex: perichaetial leaves longer, nar- 

 rower, sulcate, with a short nerve; sometimes with a long filiform point: 

 capsule immersed, oval-pyriform with a long sulcate neck, broadly 8-stri- 

 ate; annulus compound (2); teeth 8, bigeminate, yellowish, reflexed when 

 dry, densely and finely papillose; cilia 8, shorter than teeth, sometimes 16; 

 lid conic, rostellate. Braithw. Brit. Moss Flora 2: 81. 1889. On willows: 

 Clark's Fork of Coumbia River. 



216. Orthotrichum urnigerum Myrin. Monoicous: tufts lax, bright 

 green to yellowish brown, reddish-brown radiculose at base: stems pros- 

 trate or in thick tufts, erect, 2-5 cm. long: leaves when dry loosely ap- 

 pressed, when moist becoming recurved and falcate spreading, lower lax 

 upper larger and tufted, lanceolate from an ovate base, long pointed, 

 keeled; margins strongly revolute as far as middle; costa vanishing below 

 apex; cells uniform throughout in size, roundish quadrate or hexagonal, 

 thick walled, papillose on both sides with simple or furcate papillae, short 

 rectangular at leaf base: perichaetial leaves somewhat larger, erect, longi- 

 tudinally furrowed at the base: capsule half immersed, thick oval, 8-stri- 

 ate; neck short, when dry suddenly contracted into seta; lid short, annu- 

 lus persistent, compound; peristome double; teeth 16, papillose below, 

 vermicular and longitudinally striate above; cilia 16. Limpr. Laubm. 2: 46. 

 Yellowstone National Park. 



217. Orthotrichum Roellii Vent. Tufts pulvinate cespitose, closely 

 radiculose: stems erect, branching: leaves from ovate lanceolate to lanceo- 

 late acuminate, cells below incrassate, rotund, papillose with simple or 

 furcate papillae; cells above quadrangular, elongated, smooth; margin revo- 

 lute nearly to apex: autoicous: capsule cylindric ovate, scarcely exserted, 

 when dry faintly sulcate to middle, striae of 2 short rows of cells, other 

 cells quadrangular; stomata superficial; collum short, defluent into seta; 

 peristome teeth 16, simple, approximate in pairs, when dry erect or spread- 

 ing, above longitudinally striate, striae below inclined, rarely mixed with 

 papillae; scarcely a vestige of cilia found, but when present shorter than 

 teeth; spores IQ-lSjn, minutely papillose. Bot. Centralbl. 44: 360. 1890. 

 O. lonchothecium C. M. & Kindb., Mac. Cat. 90. Rocks: Ellensburgh, 

 Washington; trees: Krao Creek, Kootenai Lake, B. C.; Banff, Rocky 

 Mountains. 



218. Orthotrichum Schlotthaueri Vent. Tufts dense, pulvinate, fus- 

 cous-green: stems erect, branched, 1.5-3 cm. high: leaves when dry closely 

 appressed, when moist apex quickly recurved, then erect spreading, lanceo- 

 late from an oblong base, acute, 2-3 mm. long; upper cells rotund-angular, 

 walls thick, papillae thick, often furcate; margin reflexed: autoicous: cap- 

 sule immersed, elongate-ovate and cylindrical, smooth when dry, not con- 

 stricted under the mouth, not sulcate, more or less long pedicellate from 

 defluent collum, all together 3-4 mm. high; stomata superficial; annulus 



