218 BULLETIN OP THE UNIVERSITY OF WISCONSIN. 



Leaves not margined or only indistinctly. 

 Closely appressed, imbricate. 



Broadly ovate or obovate, abruptly apiculate B. argenteum, 234. 



Ovate or lanceolate, not abruptly pointed . . B. Blindii, 309. 

 Spreading, distant .- . . . . ' . B. Duvalii, 1 238. 



2. Cost a excurrent, leaves long -cuspidate. 



a. Capsule short (1: 2 or less). 



Constricted between sporangium and collum . . B. Yersicolor, 233. 

 Not constricted between sporangium and collum B. coronatum, 232. 



b. Capsule longer (1: 3-\-). 



i. Collum long, y^ sporangium or more. 



Leaves bordered with two or more rows of cells. 



Strongly twisted when dry, revolute . . . B. cipillare, 8 235. 

 Erect and straight when dry. 



Capsule scarcely constricted under the mouth, collum 



costate, leaf margin revolute. . . . B. obconicum, 236. 

 Capsule constricted under the mouth, collum smooth, 



leaf margin plane B. elegans, 319. 



Leaves not or very indistinctly bordered. 

 Abruptly cuspidate, oblong spatulate or obovate lance- 

 olate B. Henderson!, 301. 



Gradually cuspidate, lanceolate or ovate-lanceolate. 

 Capsule constricted below the mouth . . B. csespiticium, 235. 

 Capsule not constricted ... B. Tancouveriense, 315. 



ii. Collum short (14 sporangium or less) . B. occidentale, 236. 



111. Rhodobryum. 



Costa stout, excurrent, leaf margins revolute % to % 



length B. Ontariense, 337. 



Costa vanishing, leaves plane B. lucidum, 338. 



IV. Anomobryum. 



Costa subexcurrent ... . . . B. concinnatum, 240. 



Costa vanishing below apex . . . . . B. bnllatuni, 339. 



The following species, described from sterile or immature specimens, are 

 not included in the key, since the meager descriptions render it impossible 



J See Appendix, nos. 334, 335. 

 2 See Appendix, no. 317, 318, 344. 



