— 266 — 



lus very narrow not revoluble. Plants short simple loosely 

 cespitose. — Amer. r. U. S.»: Lesq. et Jam. 

 SS.B.spadicea Mitten. 



Leaves channelled with short ovate base and longer acumen, 

 reflexed below middle; lowest basal cells short-rectangular. Cap- 

 sule cyUndric; teeth shoii nearly straight. Tufts brown-green 

 or fuscous not low. — On stone r. Eur. Norway, Switzerl.! 

 Engl.: Whitehead. Germany: Schliephacke. Amer. Can.: Ma- 

 coun. 



* B.Zetterstedtii Schimper. — Didymodon Sch.; Barbula Kindb.; 

 B. vaginata Lindb. 



Leaves larger very acute, the perichetial halt-sheathing. Cap- 

 sules not seen. Resembles Didymodon rigidulus. — Rocks r. 

 Eur. Sweden!; J. E. Zetterstedt; Lindberg. 

 d. VineaUformes. 



A. Leaves reflexed all around; cells very pellucid. Plants 

 small. 



89.B.Tirescens Lesquereux. 



Leaves small broadly ovate-lanceolate nearly smooth; cells 

 gen. short weU-distinct, the upper round-oval not confluent. 

 Capsule small cylindric; teeth contorted. Tufts green dense 

 about 1 c. m. high. — Rocks r. Amer. U. S. Calif, near Oak- 

 land: Bolseuder, com. C. Mueller. 



B. Leaves partly flat at borders. Plants us. high and 

 robust. 



a. Upper leaf-cells opake confluent very papHlose. 



aa. Leaf-base long ovate-lanceolate; costa not excurrent. 

 90.B.cylindrica Taylor. — Zygotrichia Tayl.; Barbula Schimp. 



Leaves large entire with long nan-ow acumen, crisped; basal 

 cells short-rectangular. Perichetial leaves gradually acuminate; 

 costa subexcurrent. Capsule reddish cylindric; teeth once con- 

 torted. Tufts rusty red us. high. Very r. fruiting in Europe. 

 — Rocks and stonewalls. Eur. not r. in warmer distr. Swe- 

 den, Switzerl.! Belgium: Gravet. Amer. Can. Pacif. dist.: Ma- 

 coun. U. S.: RoeU. 

 91.B.siniiosa Wilson. — Dicranella Wils.; Barbula Braithwaite. 



Differs from the last: Leaves lurid green less reflexed with 

 broader base and longer sinuolate-denticulate acumen, often 

 brittle; lower basal cells rectangular subhyaline. Capsules un- 

 known. Habit of Didymodon tenuirostris. — Rooks r. Eur. 

 Austria: Venturi. Engl.: Boswell. France: Berthoumieu. Bel- 

 gium: Gravet. Amer. U. S. Wash.: Eoell. 



