BARNES - NORTH AMERICAN MOSSES. 169 



f f Leaf -cells long (1 : 5 or more). 1 



Leaves unicostate half way or more. 

 Seta rough. 3 



Leaves deeply plicate lengthwise . . Camptothecinm, 331. 234. 

 Leaves not deeply plicate. 



Lid convex conic to long conic (rostellate in Seler. ccespitosum). 

 Leaf -cells not abruptly enlarged at base, upper 



usually distinct, elongated rhombic IJrach yt hoc i u in. 334. 235. 

 Leaf -cells abruptly enlarged at the base, indistinct, 



linear- vermicular 3 . . . Scleropodium. 346. 237. 

 Lid more or less long rostrate . EurhvncMum, 351. 238. 

 Seta smooth. 4 



Lid more or less long rostrate. 



Leaves ovate or ovate lanceolate Rliyncliostegium, 358. 240. 



Leaves deltoid . ... . Eurhynchium, 351. 238. 



Lid convex to conic or apiculate. 



Branches fasciculate, stoloniferous, leaves generally 



papillose, not plicate . . . Isotlieciurn. 347. 238. 



Branches irregularly pinnate, leaves not pap- 



illose ...... Brachytkecium, 334. 235. 



Branches regularly or irregularly pinnate, leaves not 



papillose, when plicate also falcate-secund . Hypnum, 6 244. 

 Leaves ecostate, or costa very short or double. 

 Leaves secund. 

 Paraphyllia none . . ... . Hylocomium, 6 409. 250. 



Paraphyllia few or abundant .... Hypnum, 244. 



Leaves complanate spreading. 

 Lid rostrate. 



Leaves serrulate to the base . . Rhynchosteginm, 358. 240. 



Leaves entire or serrulate at the apex Pla&riothecium, 362. 241. 



Lid convex or conic .... Plagiothecinm, 362. 241. 



Leaves equally spreading [also Hylocomium 185-188]. 



Lid long subulate-rostrate . . Raphidostesrinm. 355. 239. 



Lid conic or short rostrate. 



Capsule symmetric, erect or cernuous Plagiothecium, 362. 241. 



Capsule unsymmetric, arcuate . . . Hypnum, 5 244. 



species, especially riparium and vacillans, may be sought here. 

 8 Isothecium lentum, Rhynchostegium, curvisetum, and JBypnum chloropterum 

 will be sought here. 

 8 Brachythecium populeum will be sought here. 



* Camptothecium, nitens will be sought here. 



* Including the subgenera XVII to XXVI of L. & J. Man. 407. 



* Including Pleurozium of L. & J. Man. 407. 



