— 300 — 



Leaves narrower than in the last and less obtusate or sub- 

 acute subinvolute nearly all around; cells larger; costa shorter, 

 sometimes ceasing far below apex. — Trees r. Amer. Can.: 

 Macoun. ' 



B. Capsule with short neck; teeth wanting. 

 S.O.gymnostomum Bruch. 



Leaves subovate-oval obtusate obtuse involute all around; 



costa subpercurrent brown opake. Perichetial leaves narrower 



sometimes acute. — Trees princ. Populus tremula r. Eur. 



Sweden not uncommon, Norway! Amer. Can.: Waghorne. 



II. Dorcadion Adanson; Lindberg. 



1. Speciosa. 



A. Capsule short-emergent; pedicel very short; teeth free 

 or slightly connate at base. 



4.0fBol8e]ld6ri SulUvant icon, muscor. 



Leaves ovate-lanceolate short-acuminate subacute, faintly re- 

 curved below, flat above, faintly papillose, appressed when dry, 

 falcate when moistened. Capsule short-necked, smooth when 

 young finally sulcate; teeth yellowish appressed when dry; 

 calyptra hairy. Tufts about 3 c. m. high. — Rocks r. Amer. 

 »U. S.»: Hullivant. 

 S.O.psilothecium C. M. et Kindb. 1. c. 



Differs from the last: Leaves shorter often obtuse or obtusate, 

 recurved nearly all around, less papillose, not appressed when 

 ■dry. Peristomial teeth not connate. Calyptra finally glabrous. 

 Tufts 1 — 2 cm. high. Capsule greenish as in 0. affine. — 

 Trees r. Amer. Can.: Macoun. U. S. Oregon: Roell. 



B. Capsule exserted gen. long-emergent; teeth connate in 

 pairs. 



a. Capsule arrounded below, not defluent to the short neck. 

 6.0.ISBTigatum Zetterstedt. — O. rhabdophorum Venturi ? 



Leaves broadly ovate-lanceolate short- acuminate not subulate. 

 Capsule brown us. wholly smooth; pedicel longer. Tufts dark 

 green or blackish not high. — Alp. rocks r. Eur. Norwaj': 

 J. E. Zetterstedt; I. Hagen. — Amer. Can. Pacif. distr.: Macoun. 



b. Capsule defluent to the long neck. 



aa> Capsule not or very faintly sulcate when old. 

 T.O.Kingii Lesquereux; SuUivant icon. m. 



Leaves as in the last but nearly appressed when dry. Capsule 

 longer or shorter than pedicel; teeth whitish erect when dry; 

 calyptra hairy. Tufts as in the last, 1 — 2 c. m. high. — Rocks r. 

 Amer. Can. Brit. Col.: Macoun. U. S.: Henderson, com. Cardot. 



