Leaves narrower than in the last and less obtusate or sub- 
acute subinvolute nearly all around; eells larger; costa shorter, 
sometimes ceasing far below apex? — Trees r. Amer. Can.: 
Macoun. | 
B. Capsule with short neck; teeth wanting. 
3.0.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. CE 
4,0.Bolenderi Sullivant icon. muscor. ja 
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. 8.»: Sullivant. 
5.0.psilothecium C. M. et Kindb. l. 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 c. m. high. Capsule greenish as in O. affine. — 
Trees r. Amer. Can.: Macoun. U, S. Oregon: Roell. 9 
B. Capsule exseried gen, long-emergent; teeth connate in 
pairs. 5 
a. Capsule arrounded below, not defluent to the short neck. 
6.0.levigatum 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. Norway: 
J. E. Zetterstedt; I. Hagen. — Amer. Can. Pacif. distr.: Macoün. - 
b. Capsule defluent to the long neck. st 
aa. Capsule not or very faintly sulcate when old. 
7.0.Kingii Lesquereux; Sullivant icon. m. Ht 
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 t. - 
Amer. Can. Brit. Col: Macoun. U. S.: Henderson, com. Qardot. - 
