— 312 — 



Eur. riot r. France, Switzerl! Sweden: Grcenwall. Amer. r. 

 ?Can.»: Mitten. 



* O.scopuloruiu Lindberg. — 0. Arnellii and O. rufesoeus 

 Grcenwall; Limpricht. 



Leaves obtuse at apex. Calj'pti'a sometimes papillose. — 

 Eocks r. Eur. Finl.: S. 0. Liudberg. Sweden: Arnell. 



* O.Rogeri Biidel. 



Leaves gen. obtnse. Capsule red brown; teeth reddish; sto- 

 mata more immersed. — Trees r. Eur. Austria: Arnold in Ra- 

 benhorst bryotheca n. 1239. Norway: Kaurin. Amer. »U. S.»: 

 Cardot. 

 58.0.ohioense Sullivant et Ijesquereux. — Sulliv. icon. m. 



Differs from 0. pollens: Leaves decurrent, nearly smooth; 

 inner basal cells short-rectangular, the outer subquadrate, th€ 

 alar larger and rectangular. Capsule thick often immersed; 

 neck short; teeth pale; calyptra sparinglj'^ hairy. — On trees. 

 Amer. U. S.: Austin, com. C. Mueller. Can.: Macoun. 

 59.0.1eucoinitriuni Bryol. eur. 



Leaves broadly acuminate, gen. acute or subsubulate at apex, 

 faintly papillose; inner basal cells somewhat long. Capsule 

 greenish nearly or wholly exserted with long defluent neck, 

 narrower than in 0. pallens; stomata much immersed; teeth 

 whitish sometimes not connate; calyptra narrowly conic whitisb 

 nearly glabrous. Stem 0,5 — 1 c. m. high. — Trees (princ. 

 Salix alba) in southern districts r. Switzerl.!; Philibert. Austria: 

 Venturi. France: Puget. 



b. Capsule finally strangulate. 



aa. Capsule narrow oblong-cylindric, often exserted; nect 

 long; calyptra narrowly conic. 

 eO.O.tenellum Bruch. 



Leaves long carinate very papillose; inner basal cells some- 

 what long. Capsule with defluent neck; teeth pale connate in 

 pairs; calyptra yellow sparingly hairy. Stem 1 — 2 c. m. high. — 

 On trees princ. in lower districts. Eur. not common. Switzerl.! 

 Sweden!; Grcenwall. Italy: Venturi. Germany: Herpell. Amer. 

 r. Can.: Macoun. 



bb. Capsule thick oval-oblong, us. immersed; neck short; 

 calyptra broad. 

 61-O.straiiiineuni Hornschuch. 



Leaves us. long acute often carinate; inner basal cells long- 

 rectangular. Capsule piriform more or less emergent; teeth orange 

 papillose; calypti-a straw-coloresd us. with few short hairs. 



