BARNES — NORTH AMERICAN MOSSES. 



215 



Upper leaf cells sublinear 

 Seta 1 cm. long, capsule 1.2 : 2 

 Costa short excurrent or percurrent. 

 Leaves not bordered .... 

 Leaves bordered. 

 Decurrent, seta 1 cm. long 

 Decurrent, seta 2-3 cm. long 

 Not decurrent. 



Costa excurrent, leaves reddish, margin 



revolute ..... 

 Costa vanishing or barely excurrent, 

 strongly revolute .... 

 [B. flexuosiim, may be sought here.] 



B. Froudei, ^28^. 

 B. Archangel icum, 287. 



. B. KnOTvltoni, 292. 



B. brachy neuron, 286. 

 B. Labradorense, 289. 



scarcely 



B. purpurascens, 224. 

 margin 



B. lacustre, 226. 



C. Dioicous. 



Collum smooth or rugose when dry. 

 Endostome adherent to peristome, cilia none 

 Endostome free, cilia present. 



Costa percurrent, teeth bright purple 

 Costa short excurrent, teeth orange 

 Collum longitudinally sulcate when dry. 

 Leaf cells pitted, perichaetial leaves costate, 

 Leaf cells not pitted, inner perichastial leaves ecostate 



B. flexuosum, 227. 



B. Californicum, 237. 

 B. subpurpurascens, 



B. oeneum, 294. 

 B. fallax, 293. 



§IL Eubryum. 



A. Synolcous. 

 Costa not excurrent. 

 Leaf margin serrate above, apex straight 

 Leaf margin entire, apex recurved 

 Costa excurrent into a smooth point. 

 Margins recurved ..... 



Margins plane ...... 



Costa excurrent into a serrate point. 

 Leaves not decurrent, long cuspidate. 

 Not bordered, entire .... 



Not bordered, serrate or denticulate above B. 

 Bordered ...... 



. B. Oreganum, 230. 

 B. nitidulum, 305. 



B. torquescens,^ 230. 

 B. microstegium, 302. 



. B. intermedium,^ 228. 



synoico-caespiticium, 316. 



B. eirrhatnm,* 228. 



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

 S. sanguilentum in the Key. 

 ' See Appendix, no. 295. 

 s See Appendix, no, 296. 



