Orthotrichum.] BRYACE^. 167 



The species is miicli like 0. Stiirmii, but differs in the larger plants, 

 with longer narrower more recurved and spreading leaves, a more hairy 

 ealyptra, a longer capsule prominently S-ribbed throughout when dry, and 

 an inner peristome, though more or less rudimentary. 



6. O. Douglasii, Duby. Similar to 0. Texanum., differing 

 ill the leaves distinctly revolute on the borders, the upper areo- 

 lation prominently papillose, the ealyptra more enlarged at 

 base, the capsule exserted on a somewhat longer pedicel, the 

 lid longer-rostrate, and in the shorter and broader teeth with- 

 out traces of cilia. — Genev. Soc. Phys. Mem. xix. 293, t. 1, 

 fig. 2. 



* * Peristome double, the inner of 8 cilia : cajmile ribbed 



when dry. 



7. O. rupestre, Schleich. Plants long, loosely cespitose, 

 decumbent : leaves spreading, recurved when moist, strict, 

 rigid and imbricate when dry, oblong-lanceolate, revolute or 

 involute on the borders ; upper areolation very small, scarcely 

 distinct, the basilar narrowly rectangular, more or less vermicu- 

 lar near the costa, minutely papillose on both faces : ealyptra 

 campanulate, covered with yellow hairs : capsule emergent or 

 subemergent, broadly ovate, decurrent into a short neck, faintly 

 8-striate, pale yellow when young, reddish brown when old, 

 truncate when dry or slightly constricted in the middle, 8- 

 ribbed in the upper part only ; lid convex, short-beaked ; teeth 

 16, in pairs, long, close, distantly punctate, often perforated 

 along the dividing line, pale yellow, erect when dry ; cilia 

 stout, of a double series of cells, nearly as long as the teeth, 

 yellowish. — Schwaegr. Suppl. i. 2. 27, t. 53 ; Bryol. Eur. t. 217. 



Hab. On rocks, Yosemite Valley {Bolander); Nevada (Watson)', 

 Colorado ( iro//<& llothrock). 



The species varies in its more or less loose or compact tufts, the stems 

 short or elongated, and the ealyptra more or less villous. It has the same 

 appearance as O. Sturmii and O. Texanum, the characters of the peri- 

 stome essentially separating the species. 



8. O. Bolanderi, Sulliv. Plants shorter, cespitose, black- 

 ish green : leaves closely imbricate, recurved-spreading when 

 moist, oblong-lanceolate, blunt at the apex ; borders reflexed at 

 the base only; upper areolation round, angular or square, 

 bistromatic, slightly papillose, loose and elongated-oval toward 

 the base : ealyptra hairy : capsule half-emergent, oblong-oval, 

 8-costate under the orifice, short-pedicelled and obscurely 



