BARNES NORTH AMERICAN MOSSES. 239 



Leaves not filiform. 

 Leaves serrulate all around. 

 Decurrent, excavate at basal angles. 



Perichaetial leaves spreading - . - . , . E. Stokesii, 354. 

 Perichaetial leaves reflexed . . . . E. Oregranum, 355. 



Not decurrent nor excavate. 



Leaves ovate lanceolate, acuminate, segments 



split . . . . . . E. Sullivantii, 1 353. 



Leaves broad ovate, acute, segments perforate E. praelongnm, 353. 

 Leaves broad ovate, acute, segments split . E. Mans, 354. 



Leaves entire at the base. 

 Decurrent . . . . . . . E. semiasperum, 502. 



Not decurrent. 



Lid not half as long as the capsule . E. colpophyllum, 342. 

 Lid nearly as long as the capsule ... . E. Mans, 354. 



E. Dawsoni Kindb., App. 501, and E. erassinervium laxirete Kindb., 

 App. 500, are described from sterile specimens; hence they are not included 

 in this key. 



RAPHIDOSTEGIUM, p. 355. 



I. Operculum long subulate rostrate. 



Leaf margin entire. 



Ovate or ovate lanceolate, monoicous . . . R. demissum, 355. 

 Long subulate, dioicous . B. snbdemissum, 504. 



Leaf margins serrate or denticulate. 

 Filiform acuminate. 



Cilia none or rudimentary . . . . R. laxepatuluiu, 358. 



Cilia 2, stout, nearly equaling segments . . R. recuryans, 356. 

 Acute or short acuminate. 

 Decurrent . . . . . . . . R. Roellii, 1 508. 



Not decurrent. 



Capsule short, oval or oblong (1:2) . . R. microcarpnm, 357. 

 Capsule longer, cylindric (1:4). . . R. subadnatum, 506. 



II. Operculum short rostrate or conic. 



Leaves filiform acuminate. 



Cilia none, annulus none, capsule cylindric R. cylindrocarpum, 356. 

 Cilia 1, annulus simple, large, capsule oblong . R. Jamesii, 357. 



1 See Appendix, no. 503. 



