BARNES NOETH AMERICAN MOSSES. 159 



Calyptra long clavate-companulate, not plicate nor hairy. 

 Costa with loose cells in center of section Encalypta, 180. 206. 



Costa with central stereid strand . . Merceya, 1 242. 



Capsule exserted, not ribbed when dry. 



Calyptra persistent, plicate, twisted . . Calymperes, 184. 207. 

 Calyptra persistent, smooth, surpassing capsule. 

 Costa with loose cells in center of section . Encalypta, 180. 206. 

 Costa with central stereid strand . . Merceya, 1 242. 

 Calyptra not persistent, often fugacious. 



Leaves ciliate at the base, obtuse, flat (Edipodinm, 244, 245. 

 Leaves not ciliate at the base, pointed, carinate, 



distichous Eustichia, 94. 



Leaves not ciliate at the base, pluriseriate. 

 Linear-lanceolate, margins plane. 



Costa filling elongated point, plants minute, Anodns, 96. 

 Costa percurrent. 



Capsule on a short lateral branch Anoectanffinm, 54. 179. 



Capsule terminating main axis (rymnostomnm, 52. 178. 



Ovate lanceolate, margins reflexed . . Barbnla, 115. 191. 



Broad, often hair pointed, plants minute . Pottia. 100. 188. 



** 



Leaf cells plainly elongated, distinct. 



Lid small, convex or short-conic, capsule microstome. 



Leaves vertically inserted .... Schistostega, 188. 



Leaves subulate, dentate Bartramia, 203. 210. 



Leaves broad, entire, calyptra enclosing capsule Pyramidula, 196. 

 Lid large (rarely small), capsule macrostome. 



Capsule splitting at the middle . . Aphanorhegma, 196. 



Capsule dehiscing regularly above the middle, not 



covered by calyptra . . . . Physcomitrium, 196. 209. 



2. Mouth of the capsule furnished with a peristome. 

 * Peristome single. (* * on p. 164.) 

 - Teeth articulate. ( - on p. 163.) 



M- Teeth eight. (-M- -M. on p. 160.) 

 Leaves thick, coriaceous .... Octoblepharum, 91. 



[Orthotrichwm, and Ptyehomitrium ($Notarisia) may be sought here. 



i Genus only known in sterile state ; wherefore its place in the key cannot be deter- 

 mined except as its leaves ally it to Encalypta. 



