— 194 — 



Perichetial leaves long-aristate not eraarginate. — Rocks r. Atner. 



Can. Rocky mte: Macoun. 



*D.rigidum Kindb. Laubm. Schwed. u. Noi-w. 



Leaves acute short-acuminate rigid not undulate, nearly ap- 

 pressed when dry; costa subpercurrent. Tufts nearly eradieu- 

 lose, pale or whitish green when dr3'. Capsules unknown. — 

 In bogs r. Eur. Sweden near Stroemstad: P. Olsson. 

 Sl.D.pallidnm Bruch et Schimper. — D. sabuletorum Renauld 

 et Cardot. 



DiSers from D. Bergeri: Leaves gradually acuminate acute 

 short-subulate, often crisped when dry; cells sometimes suboblong; 

 costa percurrent or subexcurrent. — Sandy soil r. Atner. Can.: 

 Waghorne. TJ. S.: Sull. et Lesq. exsicc, com. Cardot; Sawyer 

 and Green, com. Cardot. 



b. Leaves brittle and narrow; angular cells uniform dilated 

 fugitive faintly yellowish; other basal cells long hyaline. Cap- 

 sule short-pedicellate. 

 32.D.lcucobasis C. M. et Kindb. 1. c. 



Leaves tapering to a ver)- long narrow nearly wholly spinu- 

 lose-serrulate acute acumen, faintly undulate and crisped when 

 dry; middle cells of lamina gen. short. Capsule not large. 

 Resembles somewhat D. fuscescens in habit. — Base of trees 

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

 Roell. 



4. Scopariiformia. 



A. Leaves rough or denticulate at back of lamina, us. cri- 

 sped and often undnlate when dry; costa sometimes excurrent. 

 33.D. datum Lindberg. — D. robustum Blytf (the inventor). 



Leaves long, tapering to a long spinulose-serrulate brittle 

 acumen, dentate at back; acumen with narrow-subulate often 

 circinnate point; cells of angles diversiform, the inner narrow; 

 other cells of lower part long, the upper short irregular; costa 

 very rough at back near apex, often excurrent. Capsules clu- 

 stered 3 — 4 not striate wheu wholly ripe. Plants yellowish 

 green very robust us. high. — Bogs and humid woods r. Eur. 

 Norway! Sweden!; Lindberg. 

 34.D.spnrium Hedwig. 



Leaves gen. not long, ovate-lanceolate acute or from subovate 

 base abruptly acuminate, subpapiUose at back, very faintly 

 serrate at the us. short acumen; cells as in the last; costa 

 abbreviate or subpercurrent, faintly rough at back. Capsule 

 solitary striate. Tufts yellowish green not high. — Dry heaths 



