— 200 — 



53.D.Miiehlenbecl{ii Brytjl. eur. 



Leaves flexuous; cells gen. not porose, the angular dilated 

 nearly uniform, the inner pale -yellow; other cells of lower 

 part gen.- narrow, the middle and upper short mixed with some 

 long near apex; costa faintly rough at back. Capsule often 

 nearly smooth. Often more robust and high- than in the re- 

 sembling D. fuscescens. — Rocks princ. in alp. or northern 

 districts, not common. Eur. Norway, Switzerl.l Prance: Hus- 

 not. Germany: Kolb, com. Warnstorf. Amer. Can;; Macouu. 

 U. S.: Eoell. 



b. Leaves not long-subulate; costa gen. percurrent. Tufts 

 sparingly radiculose. 

 54.D.i'habdocarpiim Sullivant. 



Leaves patent-erect not flexuous; angular cells diversiform, 

 the alar pale yellow; other cells gen. long; costa rough at back 

 without ridges. Capsule sulcate. Habit of D. scoparium. — 

 Subalp. woods r. Anier. Rocky mts: Lesq. et Sulliv. exsicc, 

 com. Renauld. Eur. Sweden in Lapland: E. Nyman. 

 55.B.dipteroneuron C. Mueller in Flora 1887. 

 . Leases flexuous somewhat small; alar cells brown, the others 

 liarrow or the, uppermost oval; costa with 2 serrulate ridges at 

 back, sometiiiies short-excurreut. Capsule smooth not large; 

 pedicel short. Habit of D. brevifoUum. — Amer. r. Greenl.: 

 C Wensk, com. Roell. U. S.: Roell. »Alaska: Krauses: C. M. 



B. Leaves gen. entire, r. indistinctly denticulate near apex. 

 Capsule sulcate. 



a. Leaves somewhat large; costa gen. percurrent. Tufts not 

 densely radiculose. R. fruiting. 

 56.D.breTifolium Lindberg. 



Leaves flexuous short-subulate,; sometimes less distinctly con- 

 volute; angular cells dilated nearly uniform, outer brown, inner 

 pale yellow; other cells gen. short; costa nearly smooth at back. 

 Sometimes more robust and high than in the resembling D. 

 fuscescens. — Rocks princ. in alp. or northern districts, r. Eur. 

 Sweden, Norwayl Finl.: Brotherus. Amer. Can.: Macoun; 

 57.D^padiceum Zetterstedt. — D. neglectum Juratzka. 



Leaves open-erect not flexuous, somewhat long-subulate; an- 

 gular cells diversiform, the inner hj'aline sometimes reaching 

 to costa; other cells gen. long nearly uniform; costa smooth 

 sometimes short-excurrent. Tufts often brown. Habit of D. 

 molle and D. scoparium, — Rocks in -alp. regions i: Eur. Norway; 



