— 200 — 
53.D.Muehlenbeckii Bryol. eur. H 
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. Hur. Norway, Switzerl.! France: Hus- 
not. Germany: Kolb, com. Warnstorf. Amer, Can.: Macoun. 
U. 8: Roell. ott 
b. Leaves not long-subulate; costa gen. percurrent. Tufts 
sparingly radiculose. PE 
54.D.rhabdocarpum 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. Amer. Rocky mts: Lesq. et Sulliv. exsice, —— 
com, Renauld. Eur. Sweden in Lapland: E. Nyman. a 
55.D.dipteroneuron C. Mueller in Flora 1887. KE 
Leaves flexuous somewhat small; alar cells brown, the others 
narrow or the uppermost oval; costa with 2 serrulate ridges at — 
back, sometimes short-excurrent. Capsule smooth not large —— 
pedicel short. Habit of JD. brevifolium. — Amer. r. Green: — 
C. Wensk, com. Roell U. S.: Roell. »Alaska: Krause»: C. M. 
B. Leaves gen. entire, r. indistinctly denticulate near apex 
Capsule sulcate, TE 
a. Leaves somewhat large; costa gen. percurrent. Tufts nob 
densely radiculose. R. fruiting. Í 
96.D.brevifolium Lindberg. bd 
Leaves flexuous short-subulate, sometimes less distinctly com 
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: 
fuscescens. — Rocks prine. in alp. or northern districts, 1 Hur 
Sweden, Norway! Finl.: Brotherus.. Amer. Can: Macoun. = 
57.D.spadiceum Zetterstedt. — D. neglectum Juratzka. = 
Leaves open-erect. not flexuous, somewhat long-subulate; an- 
gular cells diversiform, the inner hyaline sometimes reaching. 
to costa; other cells gen. long nearly uniform; costa. smooth 
sometimes short-excurrent. Tufts often brown. Habit of 
molle and D. scoparium. — Rocks in alp. regions r. Eur. Norwa; 
