160 BtrtLETIN OF THE UNIVERSITY OF WISCONSIN. 



++ -4-+ Teeth sixteen, calyptra mitrate. {■>-*■ ++ ++) 

 = Calyptra plicate. 



Teeth cribrose, purple Cosciiiodon, 154. 201. 



Teeth filiform, trifid Ptychomitrium, 156. 201. 



Teeth approximate or connate in pairs. 



Lanceolate to subulate, papillose . . Ptychomitrium, 156. 201. 



Triangular-lanceolate, articles quadrate. 



Basal leaf-cells linear, chlorophyllose . . . Ulota, 160. 202. 



Basal leaf -cells hexagono-rectangular, hyaline Orthotrichnm, 164. 203. 



Teeth short, pale, fragile .... Macromitrium, 178. 206. 



= =: Calyptra not plicate. 



Aquatic, floating. 

 Leaves distichous . . . Fissidens (§ Octodiceras), 89. 186. 



Leaves pluriseriate Cinclidotus, 134. 



Terrestrial. 

 Very small, gregarious. 

 Teeth broad, erose-truncate, hyaline . . Brachyodus, 98. 

 Teeth linear-lanceolate, deeply bifid . . Campylostelium, 99. 

 Larger, above 1 cm. in height. 

 Leaf-cells small, quadrate or punctate, obscure. 



Beak long-clavate Encalypta, 180. 206. 



Beak long or short, not clavate. 

 Teeth lanceolate, flat, subentire or cribrose or 



2— 3-fld to the middle .... Grimmia, 134. 197. 

 Teeth linear-lanceolate, 2 — 3-fid to below middle, or 



cleft to base into filiform segments Rhacomitrium, 147. 199. 

 Leaf-cells large, very distinct, pedicel with a 

 prominent apophysis. 

 Apophysis smaller than the capsule. 



Leaves entire, obtuse Dissodon, 189. 207. 



Leaves serrate, acute or acuminate . . Tayloria, 190. 208. 

 Apophysis exceeding the capsule . . Splachnuin, 193. 208. 



++ +-m- Teeth sixteen, calyptra cucullate. (■t-n-+ -m- ++ on p. 163.) 

 = Leaves distichous. (= = on p. 161.) 



Leaves subulate Distichium, 93. 187. 



Leaves broader, with a prominent vertical wing . Fissidens, 81. 185. 



