— t99 — 



sulcate. Tufts greenish and high. — Damp subalp. rocks r. 

 Amer. Can. Brit. Col.: Macoun. 

 49.D.algiduin Kindb. revue bryol. 1896. 



Leaves entire nearlj' straight and suberect, only the upper 

 flexuous, narrower than in D. fuscescens; angular cells nearly 

 uniform dilated; other cells very porose, gen. long; costa very 

 narrow, nearly smooth at back or slightly rough in the excur- 

 rent part. Tufts soft and silky, green or dark green, nearly 

 eradiculose. Capsules unknown. Habit of D. spadiceum; differs 

 from it princ. in not convolute leaves. — Rocks in alps r. Amer. 

 Can. Rocky mts 2700 metr. a. s.: Macoun. Eur. Sweden jn 

 Lapland, and Norway: E. Nyman. 

 * D.sulbspadiceum Kindb. n. subsp. 



Leaves straight erect subconvolute, denticulate near apex and 

 at the excurrent part of costa. Tufts brown with yellowish 

 branch-tops. Capsules unknown. — Rocks in alp. region r. 

 Amer. Can. Rocky mts 2500 metr. a. s.: Macoun. 



B. Perichetial leaves shorter than the awn. 

 50.D. sulcatum Kindb. bull. Torr. club XVII; D. trachyphjdlum 

 Ren. et Card. 



Leaves brittle not large, more or less flexuous when dry; 

 cells porose, the uppermost short, the lower long; costa broader 

 than in D. fuscescens, sometimes excurrent. Capsule sulcate. 

 Habit of D. fuscescens. — Logs and rocks r. Amer. Can. Brit. 

 Col.: J. and J. M. Macoun. N. Foundl.: Waghorne. 

 51.D.crispulum C. M. et Kindb. cat. Canad. m. 



Differs from the last: Leaves narrower, more crisped when 

 dry; cells not porose, the uppermost irregular sometimes sub- 

 oblong; costa very narrow gen. percurrent. — On earth or trees 

 in woods r. Amer. Pacif. distr. Can. Brit. Col.: J. Macoun. 

 Alaska: J. M. Macoun. U. S.: Roell. 

 52.D.perichaetiale Kindb. in Hedwigia 1896 p. 61. 



Differs from the both last in the leaves larger and broader, 

 neither crisped nor flexuous, only the uppermost subfalcate, 

 less often brittle; cells larger, narrow-linear, not or sparingly 

 porose; costa distinctly denticulate at back, not excurrent, nar- 

 rower than in D. sulcatum; capsule larger. Resembles D. sco- 

 parium and D. majus in habit. — Amer. Pacif. distr. r. U. S.: Roell. 

 6. Convolutifolia. 



A. Leaves serrulate in upper part of acumen. 



a. Leaves long-subulate; costa somewhat long-excurrent. 

 Tufts tomentose; tomentum often reddish. 



