200 BULLETIN OP THE UNIVERSITY OF WISCONSIN. 



Costa not lamellose. 

 Leaves with quadrate cells at the base, decurrent and 



semi-auricled E. depressnm, 148* 



Leaves with linear cells at the base, neither decurrent 



nor auricled. 

 Obtuse. 



Perichaetial leaves costate, seta long . . B. aciculare, 148. 

 Perichsetial leaves ecostate, seta short . . B. Neyii, 148. 

 Acute. 



Capsule oblong, not striate, teeth orange E. Macounii, 1 193.. 



Capsule oval, striate or plicate when dry, teeth 



purple .... . . E. robustifolium, 195* 



II. Branches fasciculate. 



A. Leaves muticous. 



Cells elongated above E. fasciculare, 150- 



Cells quadratic above. 

 Costa percurrent. 



Leaf cells smooth E. Tarium, 2 150- 



Leaf cells rough, simple papillae over the lumen E. canescens, 151. 

 Costa vanishing below apex, cells with geminate pa- 

 pillae over the partitions E. protensum, 192* 



B. Leaves with a hyaline point. 



Cells linear at least above. 



Hyaline point not papillose . . . . E. microcarpum, 3 150. 

 Hyaline point strongly erose-serrate and papillose E. laniiginosnm, 4 151. 

 Cells quadratic above. 



[K. micropus may be sought here.J 



Strongly papillose on both sides .... E. canescens, B 151. 

 Smooth or nearly so. 

 Annulus broad. 

 Alar cells of leaf linear ... E. heterostichum, 6 149> 



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

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



8 J2. Oreganum Ken. & Card., Bot. Gaz. 13: 198. pi. 15. 1888, is this species (fide J. Car- 

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

 lift. 



8 See Appendix, no. 200. 



4 See Appendix, no. 202. 



6 See Appendix, nos. 203, 204. 



See Appendix, nos. 196-198. 



