BARNES — NORTH AMERICAN M088E8. 205 



b. Capsule costate when dry. 



* Leaves hyaline pointed. 



Cilia of a single row of cells, teeth equidistant . 0. diaphannm, 176. 

 Cilia of two rows of cells, teeth bigeminate . . .0. canum, 176. 



* * Leaves obtuse. (* * *) 



[OO. tenellunt, puniilutn, pallens and strangulatum may also be sought here.] 



Capsule exserted 0. cylindrocarpum, 173. 



Capsule immersed. 

 Abruptly contracted to the seta, collum not evident. 



Teeth papillose 0. enryphyllum, 319. 



Teeth vermicular striate 0. Hallii, 170. 



Gradually narrowed to seta with evident collum. 

 Teeth 8, bigeminate, reflexed when dry. 

 Punctulate, cilia of 2 rows of cells . . .0. Ohioense, 170. 

 Papillose, cilia double at the base only. 



Cilia 8, shorter than the teeth ... 0. Sprucei, 215. 



Cilia 16, eight as long, eight shorter than the teeth 0. rivulare, 176. 



Teeth 16, separate, erect when dry ... 0. nudum, S20. 



* * * Leaves acute. 

 Capsule exserted. 

 Abruptly contracted to seta, collum not evident. 



Cilia 16, single series of cells ... 0. ulotseforme, 2S5. 



Cilia 8, double row of cells .... 0. consimile, 173. 



Gradually narrowed to the seta with evident collum, 



cilia 16, appendiculate .... 0. pulchellum,i 175. 

 Capsule immersed or nearly. 

 Leaves with salient furcate papillae. 



Teeth 16, separate 0. urnigerum, 216. 



Teeth 8, bigeminate. 

 Cilia of a double row of cells. 

 Teeth papillose throughout, split along the median 



line 0. pumilum Americannm, 2S0. 



Teeth punctate, yellowish white . . . 0. Watsoni, 168. 

 Teeth finely papillose below, paler above with long- 

 itudinal sinuous lines, somewhat perforate 0. alpestre, 168. 

 Cilia double at the base, single above . 0. Schimperi,^ 171. 



1 See Appendix, nos. 233, 234. 



* O. fallaz Schimp. 

 4 



