216 BULLETIN OP THE ITNIVERSITT OP WISCONSIN. 



Leaves deeurrent. 

 With a broad border. 



Leaves short-pointed ..... B. bimam,^ 229. 



IJeaves long-cuspidate .... B. caspidatant, S97. 



Without a border B. lonchocanlon, 229. 



B. Polygamous. (C) 

 Leaves long cuspidate by excurrent costa, not bordered B. provinciale, 230. 



C. Autoicous. (D) 



Leaves bordered, costa percurrent or excurrent. 



Border wide, 5-6 rows of cells, distinctly revolute B. pallescens,* 231. 



Border narrow, faintly revolute . . B. ancBctangiacenm, SS8, 



IJeaves not bordered. 



Costa excurrent B. snbrotnndnm, 231. 



Costa vanishing below the apex ..... B. teres, 306. 



D. Dioicous. 



I. Costa not excurrent, or when excurrent forming a short point only 



(2 on p. 218.) 



a. Leaves obtuse. 



Distant, broadly ovate or oblong, rounded . B. cyclophyllum, 237. 

 Thickly clothing stem, generally imbricate, narrower. 

 Not bordered. 

 Leaves strongly deeurrent ... B. obtnsifolinm, SS5. 



Leaves not deeurrent B. capitellatnm, 313. 



Bordered, sometimes indistinctly. 

 Dull olive-green, margins strongly revolute. 

 Membrane of endostome }4 length of peristome B. Mnhlenbeckii, 233. 

 Membrane of endostome low . . B. rnbicnndnlnin, SI4. 



Yellowish or dull green or purplish. 

 Costa vanishing below apex, tips of branches crimsoned. 

 Cells polygonal, thick walled . . . B. miniatTLin, 233. 

 Cells rhombic, sub-quadrate below B. Atrraterise, 234. 



Costa percurrent, red, branch tips green B. percnrrentinerve, SIS. 



1 See Appendix, nos. 298, 299. 

 ' See Appendix, nos. 303, 304 



