298 BULLETIN OP THE UNIVERSITY OF WISCONSIN. 



dense yellowish tufts fuscous below: stem 1 cm. long, sparingly branched:: 

 leaves when dry erect, when moist rather strict sub-patent, ovate lanceo- 

 late, very acute, sub-carinate, minutely papillose, apex entire, margin revo- 

 lute; costa sub-percurrent; cells very minute, obscure, basal a little 

 broader, scarcely more pellucid: capsule very narrow cylindric, smooth, 

 pale straw-yellow, long exserted, defluent when dry, into a long a strongly 

 sulcate collum; peristome teeth 16, short, subulate, when dry erect- 

 incurved, pale, hyaline, distinctly 8-10-articulate, minutely granulose 

 papillose; cilia 8, half shorter than teeth, narrow; lid long apiculate; 

 calyptra sparsely hairy. Bull. Torr. Bot. Club 6: 343. 1879. Rocks; 

 Cascades, B. C.; Washington; Idaho. 



229. Orthotrichum Blyttii Schpr. Tufts dense, wide, 1-3 cm. high, 

 brownish or olive-colored: leaves erect spreading, imbricate when dry, re- 

 curved when moist, obovate-lanceolate, revolute at border almost to sum- 

 mit; cells at base quadrangular, smooth, passing gradually into rounded 

 or sub-hexagonal cells above, with thickened walls, papillae simple or bi- or 

 tri-furcate, sometimes salient but variable, older leaves not papillose: peri- 

 chaetial leaves a little larger at base: capsule emergent, oval or oval-oblong, 

 when dry 8 costate; collum straight and suddenly contracted at base, mak- 

 ing fruit more or less pyriform; annulus persistent, compound (3-4); per- 

 istome double, teeth 8, split more or less along middle line, finely and densely 

 papillose, reflexed when dry; cilia 8, more or less complete, sometimes very 

 small or half height of teeth, of 1-2 series of cells. Husnot, Muse. Gall. 

 174. Greenland. 



230. Orthotrichum pnmilum American urn Vent. Tufts small, lax, 

 soft: leaves almost without papillae: capsule with 8 bands composed of 2 

 series of rectangular cells faintly marked; teeth 8, obtuse at point, split 

 along middle line, finely papillose. Husnot, Muse. Gall. 180. On trees, 

 locality unknown. 



231. Orthotrichum Roger! Brid. Tufts lax and irregular, 1-1.5 cm. 

 long, green or dark green: leaves more or less flexuous when dry or loosely 

 imbricate, when moist erect-spreading or only upper lanceolate half of leaf 

 spreading, carinate, lanceolate from oblong base sometimes concave or even 

 cochleariform, frequently rounded at point, obtuse, acuminate or short 

 apiculate, entire on border or denticulate near apex; border more or less 

 revolute; costa ceasing below apex; cells elongated quadrangular at base, 

 smooth, walls slightly thickened, passing gradually into rounded cells with 

 thickened walls above, papillae very small, simple, rarely more pronounced: 

 inflorescence autoicous: capsule more or less emergent, costate when dry 

 and empty, contracted below mouth before empty, oval oblong with collum 

 slightly defluent into seta, sometimes longer than sporangium; annulus- 

 double, persistent; peristome double, teeth 8, bigeminate, reflexed when 

 dry, yellowish orange or darker, more or less split or lacunose at points. 



