168 BULLETIN OF THE UNIVERSITY OF WISCONSIN. 



■M- ++ Leaves not papillose. 



Leaves costate or ecostate, complanate, pseudo-distichous. 

 Middle leaf-cells linear, cilia none or very short Homalia, 285. 227.. 



Middle leaf-cells rhomboidal, cilia solitary, % length 



of the segments .... Stereophylluni/ 411. 



Leaves costate, plants dendroid .... Climacium, 313. 231. 

 Leaves ecostate, annulus large (none in Cyl. Drummondii). 

 Cells quadrate at basal angles. 

 Teeth hyaline margined .... Platy^yrium, 307. 

 Teeth not hyaline margined . . Cylindrotliecium, 310. 231. 



Cells not quadrate at basal angles . . Orthothecium, 315. 232. 

 Leaves ecostate, annulus small, narrow . . . Pylaisaea, 308. 230^ 



-H- -)— Capsule unsymmetric, often arcuate. 

 •M- Leaf-cells large, calyptra mitrate. 



Leaves mucronate or acute or acuminate . . Hookeria, 292. 228. 

 Leaves obtuse Pterigopliyllum, 293. 



■M- ++ Leaf-cells small, calyptra cucullate. 

 [Cliniacium Ruthenicum will be sought here.l 



Tf Leaf -cells short (1 : 3 or less). (Tf Tf on page 169.) 

 [Isothecium Brewerianum may be sought here.] 

 Leaves papillose. 

 Paraphyllia present. 

 Costa short or none or double . . Heterocladium, 320. 232. 

 [JPseudoleskea nialacoclada wDl be sought here.] 



Costa strong. 

 Capsule oval or oblong, lid convex-conic Pseudoleskea, 319. 232. 

 Capsule cylindric or if oval oblong then lid long 



rostrate Thuidium, 321. 233. 



Paraphyllia none Claopodium, 327. 234. 



Leaves not papillose. 

 Shortly bicostate. 

 Stem leaves filiform pointed . . . Heterocladium, 320. 232. 

 Stem leaves not filiform pointed . . Tripterocladinm, 330. 234. 

 Unicostate or ecostate. 



{Tripterocladiuni rupestre will be sought here.] 



Plants dendroid, leaves coarsely serrate Tliamniuiu, 361. 240. 



Plants creeping, leaves entire or denticulate 



above Amblystegrium, 371. 242. 



1 Stereophyllum Wrightii R. and C. Rev. Bryol. 20: 23. 1893. (Hypnum Wrightii Sull. 

 L. and J. Man. 411.) 



