BARNES — NORTH AMERICAN MOSSES, 169 



T[ T[ Leaf-cells long (1 : 5 or more)^ 



Lieaves unicostate half way or more. 

 Seta rough. - 

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

 Leaves not deeply plicate. 

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

 Leaf-cells not abruptly enlarged at base, upper 



usually distinct, elongated rhombic Bracliytliecinm, 334. 235. 

 Leaf -cells abruptly enlarged at the base, indistinct, 



linear-vermicular* . . . Scleropodium, 3-16. 237. 



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

 Seta smooth.* 



Lid more or less long rostrate. 

 Leaves ovate or ovate lanceolate Rliynehostegium, 358. 240. 



Leaves deltoid Eurhyiichium, 351. 238. 



Lid convex to conic or apiculate. 



Branches fasciculate, stoloniferous, leaves generally 



papillose, not plicate . . . Isotiiecium, 317. 238. 

 Branches irregularly pinnate, leaves not pap- 

 illose Brachythecium, 334. 235. 



Branches regularly or irregularly pinnate, leaves not 



papillose, when plicate also falcate-secund . Hypiium,^ .'J44. 

 Leaves ecostate, or costa very short or double. 

 Leaves secund. 



Paraphyllia none Hylocomium," 409. 250. 



Paraphyllia few or abundant .... Hypnuin. 244. 



Leaves complanate spreading. 

 Lid rostrate. 

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

 Leaves entire or serrulate at the apes Plagiotliecium, 362. 241. 



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



Leaves equally spreading [also Hylocoiniuiu 185-188]. 



Lid long subulate-rostrate . . Raphidostegium, 355. 239. 



Lid conic or short rostrate. 

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



Capsule unsymmetric, arcuate . . . Hypiium,^ 244. 



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

 "i Isothecium lentum, Rhynchostegium, curvisetum, and Hypnum chloropterum 

 will be sought here, 

 s Srachytheeium populeum will be sought here. 

 * Camptotheciuin nitens wiU be sought here. 

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

 ' Including Pleuroziwtn of L. & J. Man. 407. 



