— 187 — 



a. Monoecious. Stem gen. without rhizoids above base. 

 Leaves not undulate. Capsule often strumose. 



1. Falcatiformia. 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. Puscescentiformia. Leaves not distinctly convolute, 

 narrow gen. long-subulate, not undulate; costa often excurrent. 



6. CouTOlutifolia. Leaves convolute above, not undulate, 

 broad or narrow; costa not r. excurrent. 



I. Arctoa Bruch et Schimper. 

 l.D.fulvellum Dickson, — Rryum 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. Norwayl Spetsbergen: Berggren. Sweden, 

 in Lapland (a var. with green shorter leaves and less emergent 

 capsule: »D. Anderssonih Wichura): E. Nyman. Amer. U. S.: Roell. 

 2.I).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. 

 Tufts blackish or brown when dry. — Fissures of rocks in 

 northern alp. regions r. Eur. Norwayl » Sweden*: Lindberg. 

 Amer. Greenl.: Berggren. 



II. Metzleria Schimper, as genus. 

 S.D.alpinam 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 

 a small D. albicans or a Dicranella. — Rocks in alp. region 



