168 BULLETIN OP THE UNIVERSITY OP WISCONSIN. 



M- -M- Leaves not papillose. 



Leaves costate or ecostate, complanate, pseudo-distichous. 

 Middle leaf-cells linear, cilia none or very short Homalia, 285. 22 7. 



Middle leaf-cells rhomboidal, cilia solitary, % length 



of the segments . . . * Stereopliyllum, 1 411. 

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

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

 Cells quadrate at basal angles. 



Teeth hyaline margined .... Platygyriuin, 307. 

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

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

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



j -i Capsule unsymmetric, often arcuate. 

 M- Leaf-cells large, calyptra mitrate. 



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

 Leaves obtuse Pterigophyllum, 293. 



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



[Climacium Ruthenicum will be sought here.] 



If Leaf -cells short (1 : 3 or less). fl[ 1 on page 169.) 



[Isothecium Brewerianum may be sought here.] 

 Leaves papillose. 

 Paraphyllia present. 



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

 [Pseudoleskea malacoclada will 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 . . Tripterocladium, 330. 234. 

 Unicostate or ecostate. 



[Tripterocladium rupestre will be sought here.] 



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



Plants creeping, leaves entire or denticulate. 



above . ... . . Amblystegium, 371. 242. 



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

 L. and J. Man. 411.) 



