— 306 — 
Leaves recurved below, often subulate at apex, very crisped; 
alar cells in straight transverse rows. Capsule small obovate not 
constricted; pedicel often curved or geniculate in younger state. 
— Trees r. Amer. Can.: Macoun. | 
b. Capsule long-exserted; pedicel long. Inner basal leaf- 
cells long. 
aa, Leaves not long with long cylindric papille, faintly — 
erisped; alar cells short-rectangular. Calyptra densely hairy. — 
27.0.curvifolium Wahlenberg. — Ulota Bridel. i 
Leaves obtusate acute or subobtuse, nearly flat at least a 
base, not or slightly crisped when dry, open-erect straight when 
moist. Capsule obovate sulcate in its whole length, finally 
subeylindric; 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- 
horne. 
28.0.seabridum Kindb. — Ulota Kindb. cat. Canad. m.; U. 
americana Mitten ? 
Leaves obtusate or broadly acuminate subobtuse, recurved 
below to middle, distinctly crisped when dry, faleate 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 mte: Macoun. 
bb. Leaves long with short papille, nearly smooth at least 
at borders, us. not strongly crisped (at least the elder); alar 
cells subquadrate. Calyptra densely hairy. Stem us. decum- 
bent.. Peristome not appressed; cilia very short, us. wanting. 
29 0.Ludwigii Bridel. — O. coarctatum Beauvois. eei 
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. 
30.0.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.: ' 
horne. l 
cc. Leaves long with short papillæ, not recurved at base, : 
strongly erisped. Peristome with long cilia. Stem erect. Cap- 
sule us. finally &ubcylindrie. i - 
31.0.calvescens Wilson. — Ulota Wils; Orthotrichum Kindb. 
Leaves us. subulate at apex; upper cells rotundate, the outer 
