200 BULLETIN OP THE UNIVERSITY OF WISCONSIN. 



Costa not lamellose. 

 Leaves with quadrate cells at the base, decurrent and 



semi-auricled R. depressum, 148» 



Leaves with linear cells at the base, neither decvirrent 

 nor auricled. 

 Obtuse. 



Perichaetial leaves costate, seta long , . R. acicalare, 148. 

 Perichaetial leaves ecostate, seta short . . R. Nevii, 148. 

 Acute. 



Capsule oblong, not striate, teeth orange R. Macounii,^ 193, 



Capsule oval, striate or plicate when dry, teeth 



purple R. robustifolium, 195. 



II. Branches fasciculate. 



A. Leaves muticous. 



Cells elongated above R. fascicnlare, 150. 



Cells quadratic above, 

 Costa percurrent. 



Leaf cells smooth R. varium,* 150. 



Leaf cells rough, simple papilla over the lumen R. canescens, 151. 

 Costa vanishing below apex, cells with geminate pa- 

 pilla over the partitions . . . . R. protensum, 19S. 



B. Leaves with a hyaline point. 



Cells linear at least above. 

 Hyaline point not papillose . . . . R. microcarpuin,^ 150. 

 Hyaline point strongly erose-serrate and papillose R. lannginosnm,^ 151. 

 Cells quadratic above. 



[It. micropua may be sought here. J 

 Strongly papillose on both sides .... R. canescens,* 151. 

 Smooth or nearly so. 

 Annulus broad. 

 Alar cells of leaf linear . . . R. heterostichnm,« 149. 



1 R. alternatum C. M. & Kindb., described from barren specimens, seems to be refera- 

 ble to this species. See Appendix, no. 194. 



« J2. Oreganum Ren. & Card., Bot. Gaz. 13: 198. pi. 15. 1888, is this species {fide J. Car- 

 dot in litt.) which seems to be iJ. canescens lutescens L. & J. ; fide Mrs. E. G. Britton in 

 litt. 



' See Appendix, no. 200. 



* See Appendix, no. 202. 



» See Appendix, nos. 203, 204. 



• See Appendix, nos. 196-198. 



