— 191 — 



IS.D.aspernlnm Mitten. — D. virginicum Austin; Dicranodon- 

 tium aristatum Schimper; D. Millspaughi Britton. 



Leaves and stem brittle. Leaves narrower than in the last, 

 less gradually tapering to the also in lower part serrulate acu- 

 men, less flexuous or nearly straight when dry; lower cells 

 (above the alar) dilated nearly uniform. Tufts us. pale brown, 

 very soft and silky-like. Very r. fruiting. — Rocks r. Eur. 

 Austria: A. Schmidt. Norway: Wulfsberg, com. P. Olsson. Amer. 

 U. S.: com. Cardot. 



VII. Eu-Dicranum. 

 1. Falcatiformia. 



A. Capsule sulcate when dry. 



19.D. Stark ei Weber et Mohr. — Oncophorus suecicus Arnell 

 et Jensen. 



Leaves flexuous; alar cells well-defined; uppermost cells short, 

 the others long or short. Capsule sometimes suberect and less 

 distinctly strumose. Perichetial leaves subovate us. long-aristate. 

 Tufts us. green. — Rocks princ. in alps not r. Eur. Norway, 

 Spain, Switzerl.l Sweden: R. Hartman; Arnell. France: Boulay, 

 com. Husnot. Amer. Can.: Macoun. U. S.: Roell. 



B. Capsule not sulcate. 



a. Leaves distinctly falcate also when dry. 

 20.D.faIcatum Hedwig. 



Alar leaf-cells not well-defined; other cells gen. long, the 

 uppermost short-rectangular. Perichetial leaves subovate often 

 long aristate. Tufts often blackish. — Alp. rocks r. Eur. Nor- 

 way, Switzerl.l France: Husnot. Scot!.: Rogers. Amer. »U. S.»: 

 Lesq. et Jam. 



b. Leaves flexuous not falcate. 



21 D.schisti Gunner. — Bryum Gunn.; Dicranum Lindberg; 

 D. Blyttii Schimper. 



Leaves entire; alar leaf -cells well-defined, the others short at 

 least the uppermost. Capsule distinctly necked or strumose. 

 Perichetial leaves oblong short-aristate. Tufts us. blackish 

 below. — Rocks princ. in alps and northern districts. Eur. 

 not r. Sweden (also below alps), Norway 1 Scotl.: Rogers. Spets- 

 bergen: Berggren. Portugal: Levier. Amer. r. Can.: Macoun. 

 Greenl.: Berggren. 

 22.D.pumiliira Sauter. — Aongstroemia Sauteri C. M. 



Leaves sometimes slightly denticulate; cells gen. short, the 

 alar not much distinct; costa sometimes percurrent. Pedicel of 

 the indistinctly necked capsule short. Perichetial leaves long- 



