Orthotrichum.] BRYACE^. 171 



stems about one cm. long, branching by innovations : leaves 

 close, spreading when moist, oblong at base, lanceolate, blunt 

 at the apex, revolute on the borders, smooth on both faces ; 

 areolation distinct, the upper cells small, round, the lower 

 larger, quadrangular near the border, gradually longer toward 

 the costa : calyptra more or less hairy : capsule oblong-ovate, 

 very shortly pedicellate, immersed, slightly inflated at the 

 collum, defluent into the vaginule, pale yellow, pyriform-cam- 

 panulate and distinctly 8-striate when dry and empty ; teeth 8, 

 bigeniinate, thickly punctulate ; articulations distant, 5 to 7 ; 

 cilia shorter than the teeth, of a double row of cells. — Muse. 

 Am.-Bor. Exsicc, ed. 2, n. 181 ; SuUiv. Icon. Muse. Suppl. 66, 

 t. 48. 0. Canadense, Sulliv. & Lesq. Muse. Bor.-Am. n, 121 ; 

 Sulliv. Mosses of U. States, 34. 



Var. citrinum. Leaves dark green, narrower : capsule thin, 

 yellow. — 0. citrmicm, Aust., Muse. Appal, n. 170. 



Hab. On trees; Ohio and Middle States, common. 



Eesembles the two following species, but it is a little larger and easily 

 kno^^■n by the straw-colored capsule not constricted under the orifice, the 

 whitish calyptra, and the dirty reddish teeth. 



O. Canadense, Bruch & Schimp. (Lend. Journ. Bot. ii. 607), based 

 on Drumm. Muse. Amer. n. 149 and 151, is not recognizable among the 

 specimens in our sets of Drummond's mosses, and remains a doubtful 

 species. It is characterized as differing from O. patens in its smaller cap- 

 sules, longer pedicels, and rusty red-colored teeth. 



17. O. fallax, Schimp. Plants very small : leaves oblong 

 to above the middle, lanceolate to a sharply acute point ; cells 

 of the upper areolation round, inflated, the basilar broadly 

 rectangular, sinuous ; perichoetial leaves shorter : calyptra nearly 

 naked, broadly campanulate : capsule inmiersed, subglobose 

 with a short neck, abruptly enlarged from the base and truncate- 

 oblong when dry, marked with 8 orange-colored stria3 ; teeth 

 8, bigeniinate, not easily separating, yellowish, reflexed when 

 dry ; cilia 8, short, whitish yellow, of simple cells or of a double 

 row of cells near the base only. — Syn. 264. 0. pwnihfm, 

 Schwaegr. Suppl. i. 2. 22, t. 50, in part (figs. 6, 11); Bryol. 

 Eur. t. 211. 



Var. truncatulum, Aust. Capsule narrower, oblong, cy- 

 lindrical when dry; cilia as long as the teeth. — Bull. Torr. 

 Club, vi. 344. 



Hab. The variety at the base of old buildings, Illinois {Hall) ; rare. 



