BARNES NORTH AMERICAN MOSSES. 



161 



190. 



180. 

 179. 



180. 



Dierannm, 1 67. 181. 



= = Leaves pluriseriate. 

 1f Capsule unsymmetriCj cernuous-inclined or arcuate. 



Teeth filiform-bifid from a membranous base . Desmatodon, 110. 

 Teeth irregularly lacerate or bifid to the middle or below. 

 Leaf cells not enlarged at the basal angles, roundish 



or quadrate above. 

 Lid long-beaked, leaves serrulate, peristome equaling 



half the capsule Dichodontium, 61. 



Lid long-beaked, leaves crenulate or denticulate, 

 peristome shorter ..... Cynodontium, 59. 



Lid short-beaked . Oreoweisia, 58. 



Leaf -cells not enlarged at the basal angles, oblong above, 



rectangular at base . . . ~ , . Dicranella, 64. 

 Leaf -cells enlarged-quadrate at the basal angles. 

 Linear at base, capsule not strumose, dioicous 

 Rectangular at base, capsule strumose, 



monoicous 



Leaf -cells of two kinds, in two or three layers 

 Teeth bifid to near the base. 

 Lid conic, leaves subulate .... 

 Lid conic, leaves lanceolate .... 

 Lid aristate, neck very long .... 

 Teeth not cleft, short, irregular .... 

 Teeth not cleft, cohering by their tips 

 Teeth not cleft, perforate. 

 Neck long, exceeding the capsule 

 Neck inconspicuous, plants small 

 Neck inconspicuous, plants large 

 Teeth not cleft nor perforate. 

 Lid with a short thick oblique beak 

 Lid with a short slender oblique beak 



Cynodontium, 59. 

 Leucobryum, 90. 



. Trichodon, 92. 



Ceratodon. 92. 



Trematodon, 62. 



Catoscopinm, 211. 



Conostonmiii, 207. 



Trematodon, 62. 



. Disceliniu, 188. 



Oreoweisia, 58. 



. Oreoweisia, 58. 

 Cynodontium, 59. 



179. 



187. 



187. 



187. 

 180. 



180. 



179. 



[Mielichhoferia and Funaria may be sought here.] 



If Capsule symmetric, pendulous on a flexuous pedicel. 



(T If f on p. 162.) 

 Teeth bifid to the middle 

 Teeth bifid to the base, free . . . . . 

 Teeth bifid to the common membranous base. 



Connivent and slightly twisted . 



Erect, not twisted ...... 



Teeth entire, short, plants minute . 



. Campylopus, 77. 184. 

 Dicranodontium, 77. 184. 



. Desmatodon, 110. 190. 



. Trichostomnm, 108. 190. 



. Seligeria, 96. 188. 



1 The genus Monocranum C. MulL is not included in the key on account of its doubtful 

 nature. 



