— 306 — 



Leaves recurved below, often subulate at apex, very crisped; 

 alar cells iii straigbt transverse rows. Capsule small obovate not 

 constricted; pedicel often curved or geniculate in younger state. 

 — Trees r. Amer. Can.: Macoun. 



h. Capsule long-exserted; pedicel long. Inner basal leaf- 

 cells long 



aa. Leaves not long with long cylindric papillae, faintly 

 crisped; alar cells short-rectangular. Calyptra densely hairy. 

 27.0.curvifoliuin Wahlenberg. — Ulota Bridel. 



Leaves obtusate acute or subobtuse, nearly flat at least at 

 base, not or slightly crisped when dry, open-erect straight when 

 moist. Capsule obovate sulcate in its whole length, finally 

 subcylindric; neck short; teeth finally deflexed. Tufts blackish 

 below. — Rocks princ. in northern districts gen. r. Eur. Swe- 

 den and Norway, less r. in alps! Amer. Can.: Macoun; Wag- 

 home. 



28.0.scabridum Kindb. — Ulota Kindb. cat. Canad. m,; U. 

 americana Mitten ? 



Leaves obtusate or broadly acuminate subobtuse, recurved 

 below to middle, distinctly crisped when dry, falcate when 

 moist. Capsule obovate or suboblong sulcate in upper half 

 when young, finally subcylindric; neck somewhat long; teeth 

 erect. Tufts green or brown, dark brown below. — Rocks r. 

 Amer. Can. Rocky mts: Macoun. 



bb. Leaves long with short papillse, nearly smooth at least 

 at borders, us. not strongly crisped (at least the elder); alar 

 cells Bubquadrate. Calyptra densely hairy. Stem us. decum- 

 bent. Peristome not appressed; cilia very short, us. wanting. 

 29 O.Ludwigii Bridel. — 0. coarctatum Beauvois. 



Capsule thick piriform with short stripes near the small 

 mouth; teeth erect. — On trees gen. r. Eur. Sweden, Norway! 

 France: Husnot. Amer. Can.: Macoun; Waghorne; Drummond 146. 

 SO.O.Drummondii Hooker et Greville. — Ulota Bridel. 



Capsule narrowly piriform attenuate to mouth, striped to 

 neck; teeth patent when dry. — Trees in northern distr. r. Eur, 

 Sweden, Norway! Scotl.: Hunt, com. Husnot. Amer. Can.: Wag- 

 horne. 



CC. Leaves long with short papillae, not recurved at base, 

 strongly crisped. Peristome with long cilia. Stem erect. Cap- 

 sule us. finally subcylindric. 

 Sl.O.calvescens Wilson. — Ulota Wils.; Orthotrichum Kindb. 



Leaves us. subulate at apex; upper cells rotundate, the outer 



