Psilopilum.] BRYACE^. 259 



and slender : leaves open or spreading, oblong-lanceolate, 

 smooth, blunt-pointed, entire at base, sliort-dentate above, alate 

 on the back by longitudinal dentate lamellas ; costa percurrent, 

 carinate, 5-7-lamellate ; areolation round-quadrate, distinct ; 

 pericliffitial leaves ovate, sheathing at base, erect, narrower and 

 subulate to the apex, with round pellucid areolation: male 

 plants shorter, proliferous from the centre of the flowers : calyp- 

 tra with a few erect hairs on the upper part : capsule of the 

 same form as in the last species. — Journ. Linn. Soc. viii. 48, 

 t. 8 ; Sulliv. Icon. Muse. Suppl. 55, t. 39. 



Hab. Grand Cote, Rocky Mountains {Drummond). 



2. O. Lyallii, Lindb. Plants robust, cespitose, dirty yellow • 

 stems fastigiately branching from the middle, plicate, naked at 

 base, densely foliate above : leaves broader, oblong, clasping at 

 base, open, narrowly lanceolate-acuminate above, densely lamel- 

 late, convex and smooth on the back ; borders incurved, dis- 

 tantly serrate from the middle npAvard ; inner perichagtial 

 leaves with a long convolute base and a short acumen : male 

 flowers unknown : calyptra fugacious, with few appressed haii-s, 

 split on one side : capsule on a long flexuous reddish pedicel, 

 slightly inclined, cylindrical-oblong, ventricose below, bij^licate 

 above, plicate-rugose at base when empty ; lid broadly conical 

 at base, subulate-rostrate. — Obs. Polytrich. in Faun. Flor. 

 Fenn. ix. 102. P ohjtrichadelplius Z,yallii., Mitt. Journ. Linn. 

 Soc, viii. 49, t. 8 ; Sulliv. & Lesq. Muse. Bor.-Am. Exsicc. (ed. 

 2), n. 322. 



ITab. British Cohunbia (Lyall); Rocky Mountains, Colorado, in pine 

 woods (E. Hall); high mountains of California (Bolander). 



95. PSILOPILUM, Brid. 

 In aspect and mode of growth like OligotricJmm. Leaves 

 oblong, sheathing at base, open, erect above, obovate-oblong, 

 very concave, muticous at the slightly incurved apex ; borders 

 irregularly crenulate above ; lamellre of the costa subundulate, 

 gradually narrowed, thin and disappearing toward the base ; 

 upper areolation minute, subquadrate, long-rectangular at the 

 sheathing base. Calyptra very narrow, smooth. Capsule 

 ovate-gibbous, incurved, laterally compressed, stomatose at 

 base, rugulose when dry, the orifice narrow. Lid short, convex- 



