— 305 — 



exserted; pedicel somewhat long. Tufts dark green, blackish 

 below, somewhat high. — Trees and rocks r. Amer. Can, Vane, 

 isl.: Macoun. 



IV. Ulota Mohr. 



A. Leaves not or indistinctly crisped; hyaline alar cells gen. 

 uniseriate or indistinct. 



a. Leaves longish not twisted; nearly all cells short. 

 22.0.americanum Beauvois. — Ulota Hutchinsise (Smith) 

 Hammar. 



Leaves more or lees recurved princ. at base, broadly ovate- 

 lanceolate gen. subobtuse at apex. Capsule thick piriform; ca- 

 lyptra densely hairy. Tufts green or blackish. — On rocks or 

 r. on trees. Eur. common. Sweden, Norway, Switzerl.i Amer. 

 Can.; Macoun; Waghorne. 

 23.0.sult)ulatuni C. M. et Kindb. — Ulota C. M. et K. 1. c. 



Leaves not recurved, ovate-lanceolate subulate-filiform at apex, 

 nearly appressed "when dry. Capsule small narrow-clavate. 

 Tufts dark green or blackish. — Trees r. Amer. Can. Brit. Col.: 

 Macoun. 



b. Leaves short faintly twisted when dry; basal cells long. 

 24.0.Barclayi Mitten. — Ulota Mitt.; SuUiv. icon, m.; Ortho- 

 trichum Kindb. 



Leaves gen. ovate-oblong subacute, not or faintly recurved 

 below, flat to the greater part. Capsule subobovate thicker 

 than in 0. americanum; calyptra sparingly hairy. Tufts brown- 

 green. — In alp. princ. arctic districts r. Amer. Alaska: J. M. 

 Macoun. U. S.: Roell. 



B. Leaves long very crisped; hyaline alar cells gen. indi- 

 stinct. 



25.0.niegalosporuui Venturi. — Ulota Vent.; Orthotrichum 

 Kindb.; Ulota subulifolia C. M. et Kindb. 1, c. 



Leaves recurved at base, subulate-piliform at apex; upper 

 cells rotundate, the basal long. Capsule small short-obovate 

 sulcate finally subcylindric; pedicel long thin; calyptra nearly 

 glabrous. Stem often creeping. — Trees r. Amer. Pacif. distr. 

 Can.: Macoun. U. S,; Roell. 



C. Leaves more or less crisped; hyaline alar cells in several 

 rows. 



a. Capsule gen. not wholly exserted; pedicel short. Leaves 

 long distinctly papillose nearly opake; nearly all cells short. 

 26.0.COiinectens Kindb. in Ottawa Natur. IV, 64. — Ulota 

 camptopoda Kindb. oat. Canad. m. 



