— 186 — 
Leaves of male plants sometimes obtuse. Tufts very tomen- 
tose to the green tops, often high. — Wet rocks r. Amer, 
Pacif. distr. Can.: Macoun. U. S.: Roell; Henderson, com. Gardot. 
» Dichodontium olympicum Renauld et Cardot (ined. Leaves very 
papillose, minutely denticulate nearly all around; capsule strumose. — 
— U. S. Wash: Henderson»: Cardot in Musci Amer. sept. — Speci- 
mens not seen. 
91. Dicranum Hedwig. 
A. Capsule straight (in D. hyperboreum faintly oblique) no 
strumose. Leaves not undulate; cells gen. not porose. 
a. Monoecious. Leaves entire us. small. Pedicel of cap- 
sule not long. Stem gen. without rhizoids above base. 
I. Aretoa. Leaves channelled; alar cells us. distinct; costa 
narrow more or less excurrent. Capsule not large; teeth often 
spreading when dry; pedicel sbort-emergent. 
II. Metzleria. Leaves convolute above; alar cells not well- 
defined; costa very broad long-excurrent. Capsule small; teeth 
not spreading; pedicel exserted. Plants small. . 
b. Dioecious. Leaves sometimes dentieulate us. large. Pe- 
dicel of capsule long. Stem radiculose also above base. pt 
aa. Leaves with narrow or not very broad costa; alar cells — 
persistent. A 
HI. Orthodieranum. Leaves channelled or convoltite above; d 
upper cells subquadrate. Pedicel of capsule straight; peristomial 
teeth cleft. Tufts us. green. 3 
bb. Leaves with very broad long-excurrent costa. wore 
IV. Paraleucobryum. Leaves subconvolute above, persistent; — 
alar cells persistent us. brown, the others few short-rectangular; 
costa thick formed by 3 layers as in Leucobryum glaucum, middle — 
layer consisting by small green cells. Pedicel of capsule straight; — 
teeth often partite. "Tufts whitish green. Calyptra very long.  — 
V. Pseudo-Campylopus. Leaves channelled persistent; alar — 
cells persistent brown, the others numerous rectangular; E 
not thick. Pedicel of capsule straight; teeth cleft. Tuftsgreen 
or brownish. -— 
VI. Dicranodontium. Leaves channelled soon deciduous; alar de 
cells fugitive pale, the others numerous rectangular; costa mob — 
thick. Pedicel of capsule arcuate; teeth often partite. Tufts — 
green or brownish. é 
B. Capsule curved or oblique sometimes strumose. Leaves 
often undulate when dry; cells often porose. xe 
VIL Eu-Dieranum.  Peristomial teeth cleft. Leaves with 
narrow or not much broad costa. E. 
