BARNES — NORTH AMERICAN MOSSES. 169 



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



Xie.aves unicostate half way or more. 



Seta rough. ^ 

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

 Leaves not deeply plicate. 

 Lid convex conic to long conic (rostellate in Scler. ecespitosum). 



— Leaf-cells not abruptly enlarged at base, upper 



usually distinct, elongated rhombic Brachythecium, 334. 235. 

 Leaf -cells abruptly enlarged at the base, indistinct, 



linear-vermicular" . . . Scleropodinm, 346. 237. 



~" Lid more or less long rostrate . . Eurhyncliium, 351. 238. 

 Seta smooth.* 



Lid more or less long rostrate. 



_ Leaves ovate or ovate lanceolate Rhynchostegiuin, 358. 240. 



.- Leaves deltoid Eurhynchinm, 351. 238. 



Lid convex to conic or apiculate. 

 Branches fasciculate, stoloniferous, leaves generally 



papillose, not plicate . . . Isotliecium, 347. 238. 

 -- Branches irregularly pinnate, leaves not pap- 

 illose Brachythecinm, 334. 235. 



— Branches regularly or irregularly pinnate, leaves not 



papillose, when plicate also falcate-secund . Hypnnm,^ 344. 

 lieaves ecostate, or costa very short or double. 

 Leaves secund. 



- Paraphyllia none Hylocomiuni, » 409. 250. 



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



Leaves complanate spreading. 

 Lid rostrate. 



- Leaves serrulate to the base . Rhynchostegiuin, 358. 240. 

 Leaves entire or serrulate at the apex Plagiothecium, 362. 241. 



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



Leaves equally spreading [also Hylocomium 185-188]. 

 -^ Lid long subulate-rostrate . . Raphidosteginm, 355. 239. 



Lid conic or short rostrate. 



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



_ Capsule unsymmetrio, arcuate . . Hypnum,^ 244. 



1 Amhlystegiuni, species, especially riparium and vadllans, may be souglit here. 

 3 JsotJiecium ientum, Mliynchostegiwnh curvisetum, and M-ypnum chloropterum 

 win be sought here. 

 3 JBrachytheeium populeum will be sought here. 

 * CamptotheciUTn nitens will be sought here. 

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

 " Including Pleuroziwm of L. & J. Man. 407. 



