216 BULLETIN OP THE UNIVERSITY OP WISCONSIN, 



Leaves decurrent. 

 With a broad border. 



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



Leaves long-cuspidate .... B. cnspidatam, f.97. 



Without a border B. lonchocaulon, 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. ancectangiacenm, 328. 



Leaves not bordered, 



Costa excurrent . . . ' . . . B. subrotundum, 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. cyclophyllain, 237. 

 Thickly clothing stem, generally imbricate, narrower. 

 Not bordered. 



Leaves strongly decurrent ... B. Obtusifolinm, 325. 



Leaves not decurrent B. capitellatam, 313. 



Bordered, sometimes indistinctly. 



Dull olive-green, margins strongly revolute. 

 Membrane of endostome J^ length of peristome B. Mnhlenbeckii, 233. 

 Membrane of endostome low . . B. rubicundulum, 314. 



Yellowish or dull green or purplish. 



Costa vanishing below apex, tips of branches crimsoned. 

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

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



Costa percurrent, red, branch tips green B. percurrentinerve, 312. 



> See Appendix, nos. 298, 299. 

 ' See Appendix, nos. 303, 304. 



