— 187 — 
. &. Monoecious. Stem gen. without rhizoids above base. 
Leaves not undulate. Capsule often strumose. 
1. Faleatiformia. Leaves channelled not large, flexuous or fal- 
cate; costa us. long-excurrent. Capsule not large. Plants not robust. 
2. Molliformia. Leaves large convolute above, nearly straight; 
costa not or slightly excurrent. Capsule large. Plants robust. 
< b. Dioecious. Stem us. tomentose. Leaves sometimes un- 
dulate. Capsule not strumose. 
aa. Leaves carinate above. 
3. Carinatifolia. Leaves gen. broad at base, often undu- 
late; costa subpercurrent. 
bb. Leaves channelled at least below, not carinate above. 
4. Scopariiformia. Leaves not distinctly convolute above, 
broad at base, not long-subulate, sometimes undulate; costa r. 
excurrent. 
5. Fuscescentiformia. Leaves not distinctly convolute, 
narrow gen. long-subulate, not undulate; costa often excurrent. 
6. Convolutifolia. Leaves convolute above, not undulate, 
broad or narrow; costa not r. excurrent. 
I. Arctoa Bruch et Schimper. 
1.D.falvellum Dickson. — Bryum Dicks; Dicranum Smith. 
Leaves us. flexuous or falcate, sometimes nearly straight; 
alar cells not. well-defined, the others gen. long; costa often denti- 
culate above. Capsule small straight strangulate not or faintly 
striate; teeth spreading when dry. Tufts us. yellowish. — Rocks 
In alp. region r. Eur. Norway! Spetsbergen: Berggren. Sweden, 
in Lapland (a var. with green shorter leaves and less emergent 
Capsule: » D. Anderssonii» Wichura): E. Nyman. Amer. U. S.: Roell. 
2.D.hyperboreum Gunner. 
Leaves flexuous or nearly straight, larger than in the last: 
alar cells well-defined; uppermost cells short; costa not or indi- 
stinctly denticulate. Capsule somewhat oblique sulcate wide- 
. mouthed not constricted, larger than in the last; teeth erect. 
| fts blackish or brown when dry. — Fissures of rocks in 
. Borthern alp. regions r. Eur. Norway! »Sweden»: Lindberg. 
Amer. Greenl.: Berggren. 
II. Metzleria Schimper, as genus. 
. &B.alpinum Schimper. — Metzleria Sch.; Dicranum Kindb. 
Leaves narrowly ovate-oblong somewhat flexuous; cells rect- 
. angular: outer basal narrower; costa smooth. Capsule oblong- 
. Oval not sulcate; calyptra long. Tufts pale brown. Resembling 
. 4 small D. albicans or a Dicranella. — Rocks in alp. region 
