— 259 — 



53.B.platyneura C. M. et Kindb. 1. c. 



Differs from B. revoluta: Leaves shorter, ovate-oblong acute; 

 costa distinctly excurrent. Capsules unknown. — Rocks r. 

 Amer. Can. Brit. Col.: Macoun. 



54.B.revolTens Schimper. — Desmatodon Husnot m. G. 



Leaves oval-oblong obtusate us. obtuse, revolute nearly to 

 apex; pronainent lamina somewhat broad; costa scarcely excur- 

 rent not broader above. Perichetial leaves sheathing not revo- 

 lute. Capsule oblong; teeth once contorted. Tufts loose. — 

 Stonewalls r. Eur. France; Philibert. 



B. Leaves simply not spirally revolute. Peristome half- 

 twisted. 



55.B.atroviren8 Smith. — Grimmia Sm.; Barbula Schimper; 

 Desmatodon nervosus Br. eur. 



Leaves oblong-linear or suboval obtusate, revolute nearly to 

 apex; prominent lamina broad; costa broader above us. short- 

 excurrent. Perichetial leaves similar; the innermost one shor- 

 ter, neither revolute not sheathing, Capsule suboval. Tufts 

 loose. — On stone in warmer distr. r. — Eur. France: Le Jolis. 

 Amer. »U. S.»: Lesq. et Jam. 



56 B.subtorquescens C. M. et Kindb. 1. c. 



Differs from the last: Leaves less opake and more obtuse 

 not revolute near apex; prominent lamina broader; costa gen. 

 percurrent not broader above. Capsule cylindric. Tufts some- 

 what higher, very compact. — Rocks r. Amer. Can Gaspe 

 coast and Assa: Macoun. 



2. Streblotrichum Palisot de Beauvois. 



A. Pedicel yellow. Spores small. Dioecious. 



a> Peristome much contorted; annulus revoluble. Leaves 

 papillose entire narrow, crisped; basal cells short-rectangular hya- 

 line; costa not excurrent. Tufts us. low. 

 57.B.C0UTOlHta Hedwig. — B. Closteri Austin ? 



Leaves sublinear or oblong-lanceolate obtusate gen. not reflexed: 

 perichetial nearly nerveless with short point. Capsule oblong; 

 lid shorter. — On earth. Eur. common below alp. regions. 

 Sweden, Norway, Switzeri.l Amer. Can.: Macoun. 

 * B.commutata Juratzka. — Trichostomum undatum Schimper. 



Stem higher. Leaves narrow-lanceolate much longer: peri- 

 chetial broadly acuminate. Capsule larger. — Wet calcareous 

 rocks also in alps r. Eur. Switzeri.l Engl.: Burgess. Belgium: 

 Roemer. 



