BARNES — NORTH AMERICAN MOSSES. 161 



=: = Leaves pluriseriate. 

 \ Capsule unsymmetric, cernuous-inclined or arcuate. 



Teeth filiform-bifld from a membranous base . Desmatodon, 110. 190. 

 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 Dichodontinm, 61. 180. 



Lid long-beaked, leaves erenulate or denticulate, 



peristome shorter Cynodontium, 59. 179. 



Lid short-beaked Oreoweisia, 58. 



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



rectangular at base Dicranella, 64. 180. 



Leaf-cells enlarged-quadrate at the basal angles. 

 Linear at base, capsule not strumose, dioicous Dicranum,^ 67. 181. 

 Rectangular at base, capsule strumose, 



monoicous Cynodontinm, 59. 1 79. 



Leaf-cells of two kinds, in two or three layers Leucobrynm, 90. 187. 

 Teeth bifid to near the base. 



Lid conic, leaves subulate Trichodon, 92. 187. 



Lid conic, leaves lanceolate .... Ceratodon, 92. 187. 

 Lid aristate, neck very long .... Trematodon, 62. 180. 



Teeth not cleft, short, irregular .... Catoscopinm, 211. 

 Teeth not cleft, cohering by their tips . . Conostomum, 207. 

 Teeth not cleft, perforate. 

 Neck long, exceeding the capsule . . . Trematodon, 62. 180. 

 Neck inconspicuous, plants small . . . Discelium, 188. 



Neck inconspicuous, plants large . . . Oreoweisia, 58. 

 Teeth not cleft nor perforate. 

 Lid with a short thick oblique beak . . . Oreoweisia, 58. 

 Lid with a short slender oblique beak . . Cynodontinm, 59. 179. 

 [MieHchhoferia and X^naria may be sought here.] 



T[ If Capsule symmetric, pendulous on a flexuous pedicel. 

 (If H H on p. 162.) 



Teeth bifid to the middle Campylopus, 77. 184. 



Teeth bifid to the base, free .... Dicranodontium, 77. 184. 

 Teeth bifid to the common membranous base. 

 Connivent and slightly twisted .... Desmatodon, 110. 190. 



Erect, not twisted Trichostomnm, 108. 190. 



Teeth entire, short, plants minute .... Seli^eria, 96. 188. 



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

 nature. 



