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r. Eur. Austria: Breidler, com. Warnstorf. Norway: Kaalaas, 

 com. E. Nyman. 



in. Orthodicranum C. Mueller. 



A. Leaves brittle and channelled. 



a. Leaves not subulate-acuminate; costa long-excurrent. 

 4.D.faIvum Hooker. 



Leaves denticulate above, cripped when dry; cells gen. short; 

 costa somewhat broad Capsule striate. Tufts us. brown-yellow. 

 R. fruiting. — Rocks princ. of sandstone in woods in lower 

 regions. Eur. princ. in southern distr. not r. Switzerl.l France: 

 Husnot. Sweden: Berggren. Norway: E. Nyman. Atner. not 

 r. Can.: Macoun. 



S.D.yiride Sullivant et Lesquereux. • — Campylopus SulL et 

 Lesq.; Dicranum Bruch et Sch.; D. subfulvum Ren. et Card. ? 



Leaves entire or r. near apex denticulate, us. not crisped or 

 sometimes nearly straight; cells short or the lowest long; costa 

 gen. less broad. Tufts us. green. Very r. fruiting. » Capsule not 

 striates: Schimper. — Us. on trees r. on rocks. Bwr. r. Switzerl.l 

 France: Husnot. Sweden: P. Larsson. Norway: Bryhn. Avier. 

 Can. eastern districts: Macoun; Moser. 

 6.D.strictum Schleicher. 



Leaves entire nearly straight; lower (inner) cells long, the 

 uppermost short-rectangular; costa narrow. Capsule not striate. 

 Tufts pale or yellowish green. R. fruit, in Europe. — Trees 

 or decayed trunks. Eur. r. Sweden 1852! Austria: Breidler, com. 

 Warnstorf. Amer. less r. princ. in Paoif. distr. Can.: J. Macoun 

 (fruit.). Alaska: J. M. Macoun. 



b. Leaves long-subulate; costa short-excurrent or percurrent. 

 T.D.subulitoliuni Kindb. bull. Torr. club XVH. 



Leaves entire, flexuous when dry; cells as in the last; costa 

 narrow. Tufts pale green. — Logs in woods r. Amer. Can. 

 Vane. isL: Macoun. 



B. Leaves gen. not brittle, us. crisped when dry; lower 

 cells gen. long; costa narrow. 



a. Leaves short-subulate, denticulate to below middle, rough 

 at back, channelled. 



S.D.montanum Hedwig. 



Leaves with not excurrent costa. Tufts very dense us. green 

 often low. — Decayed trunks. Eur. common. Sweden, Norway, 

 Switzerl.l Amer. r. Can.: Macoun; Waghorne. 



b. Leaves long-subulate, nearly entire, not rough at back, 

 us. convolute above. 



