206 BULLETIN OF THE UNIVERSITY OF WISCONSIN. 



Leaves with simple often weak papillae. 



[OO. Schimperi and pumi lum may be sought here.] 



Cilia of a single row of cells . . . . 0. Henderson!, 232. 

 Cilia of a double row of cells. 



Teeth granulose, not papillose, capsule obovate, con- 

 tracted below the mouth when dry 0. strangulatum, 172. 

 Teeth papillose, capsule sub-cylindric, little con- 

 tracted below mouth when dry. 



Calyptra hairy, teeth pale brown . . 0. tenellum, 172. 

 Calyptra naked, teeth reddish ... 0. Rogeri, 231. 



" Notes on North American Species of Orthotrichum" by E. G. Britton, 

 Bull. Torr. Bot. Club 20: 393. 1893 and 21: 1, 137. 1894, have been followed 

 in many points. O. psilothecium C. M. & Kind, is reduced to O. strang- 

 ulatum; O. Pringlei C. Mull, to O. Lyellii; O. brachytrichum 

 Schimp. to O. Schimperi; O. stenocarpum Vent, to O. Macounii 

 Aust. O. stellatum Brid. and O. anomalum Americanum are rejected 

 as doubtful. 



MACROMITRIUM, p. 178. 



Capsule plicate at mouth and base only . . M. Sullivantii, 178. 

 Capsule costate its whole length. 



Lid conic, blunt, peristome wanting . M. Fitzgeraldi, 178. 



Lid subulate, peristome present . . . M. rhabdocarpum, 179. 



Capsule smooth M. mucronifolium, 179. 



ENCALYPTA, p. 180. 



I. Capsule spirally striate and sulcate when dry. 



Capsule twisted to the right when dry, leaves with hya- 

 line hair points, teeth glabrous . . . E. Selwyni, 183. 

 Capsule twisted to the left when dry. 



Leaves cucullate . / E. cucullata, 238. 



Leaves not cucullate. 



Leaves acute or apiculate, teeth papillose, with a me- 

 dian line . . ..-,.. . . ... . E. procera, 182. 



Leaves muticous, usually obtuse, teeth filiform, no- 

 dose, minutely papillose . . . E. streptocarpa, 183. 



