BARNES NORTH AMERICAN MOSSES. 215 



Upper leaf cells sublinear .... B. Froudei, 282. 



Seta 1 cm. long, capsule 1.2 : 2 . . B. Archangelicum, 287. 



Costa short excurrent or percurrent. 



Leaves not bordered B. Knowltoni, 292. 



Leaves bordered. 



Decurrent, seta 1 cm. long . . - . B. brachy neuron, 286. 



Decurrent, seta 2-3 cm. long . : . . . B. Labradorense, 289. 

 Not decurrent. 

 Costa excurrent, leaves reddish, margin scarcely 



revolute /. . . . . B. purpurascens, 224. 



Costa vanishing or barely excurrent, margin 



strongly revolute . ... . B. lacustre, 226. 

 [B. flexuosum may be sought here.] 



C. Dioicous. 



Collum smooth or rugose when dry. 



Endostome adherent to peristome, cilia none . B. flexnosum, 227. 

 Endostome free, cilia present. 



Costa percurrent, teeth bright purple . B. Californicum, 237. 

 Costa short excurrent, teeth orange . B. subpurpurascens, 288. 

 Collum longitudinally sulcate when dry. 



Leaf cells pitted, perichsetial leaves costate, . . B. oenenm, 294. 

 Leaf cells not pitted, inner perichaetial leaves ecostate B. fallax, 293. 



11. Eubryum. 



A. Synoicous. 

 Costa not excurrent. 



Leaf margin serrate above, apex straight ... B. Oregannm, 230. 

 Leaf margin entire, apex recurved . . B. nitidulum, 305. 



Costa excurrent into a smooth point. 



Margins recurved B. torquescens, 1 230. 



Margins plane B. microstegium, 302. 



Costa excurrent into a serrate point. 

 Leaves not decurrent, long cuspidate. 



Not bordered, entire B. intermedium, 8 228. 



Not bordered, serrate or denticulate above B. synoico-csespiticium, 316. 

 Bordered B. cirrhatum, 3 228. 



iSee Appendix, no. 344. On account of the imperfect description I cannot place 

 B, sanguilentum in the Key. 

 a See Appendix, no. 295. 

 3 See Appendix, no. 296. 



