BARNES — NORTH AMERICAN MOSSES. 



195 



§V. Convolutae. 



Leaves involute on margin. 



Aristulate by excurrent costa .... 

 ' Acute or submucronate ..... 

 Leaves plane on margin or recurved. ^ 

 Capsule costate when dry .... 

 Capsule smooth. 

 Leaves acute, costa percurrent 

 Leaves with hyaline point .... 



Leaves obtuse. 



Perichsetial leaves rounded or truncate at apex B. chrysopoda, I48. 

 Perichaetial leaves obtuse or short apiculate B. convoliita var. I47. 



B. agraria, 128. 

 B. Donnellii, 128. 



. B. Raui, 128. 



B. convoluta, 127. 

 B. Closteri, 127. 



B. csespitosa, 129. 



§VI. Tortuosae. 



Leaf margin plane or undulate when moist. 

 Leaves long linear, acute, abruptly mucronate 

 Leaves very long acuminate, cuspidate. 

 Twisted crispate when dry, above of one layer of cells B. tortuosa, 129. 

 Not crispate, brittle, two layers of cells above . B. fragilis, 129. 

 Leaf margin involute, cucuUate above . . . B. iucliuatnla, 149. 



§VII. Squarrosae. 



Includes but one species 



B. squarrosa, 130. 



§VIII. Syntrichiae. 

 [B. brevipes may be sought here.] 



I. Leaves with a border of thickened cells. 



Leaves with a distinct border, sometimes absent at the apex, plane. 



Marginal cells elongated B. subulata,^ 130. 



Marginal cells roundish B. Isevipila, 132. 



Leaves with a narrow border at the base only. 



Basal cells faintly chlorophyllose . . . B. lato-excisa, 160. 



Basal cells strongly chlorophyllose . . B. papillinervis, 156. 



1 B. platyneura C. M. & Kindb., described from barren specimens falls here. See Ap- 

 pendix, no. 146. 

 ''See Appendix, no. 150. 



