BARNES NORTH AMERICAN MOSSES. 201 



Alar cells of leaf quadrate R. micropus, 199. 



Annulus none . . . * -. . B. speciosnm, 201. 



COSCINODON, p. 154. 



Costa not entering the hyaline point, which is less than 



the leaf in length. 



Dioicous, leaves oblong lanceolate C. pulyinatus, 154. 



Autoicous, leaves obovate . . . .. . C. Eaui, 1 155. 

 Costa forming a rough hyaline point twice as long as the 



leaf . . . . . . . . . C. Wrightii, 155. 



PTYCHOMITRIUM, p. 156. 



Plants large (3 cm. -j-)j leaves acuminate, sharply dentate P. Gardneri, 156. 

 Plants small (1 cm. ), leaves not acuminate, nearly or 



quite entire. 

 Collum none. 



Teeth subulate (1 : 10), entire . . . .P. incur rum, 157. 



Teeth lanceolate (1 : 4), bi- or trifid ... P. Drtiminondii, 157. 



Collum equalling one-third sporangium . . .P. pygmaenm, 157. 



AMPHORIDIUM, p. 158. 



Leaf margins plane, entire . . . . .A. Lapponicnm, 158. 



Leaf margins recurved or revolute. 



Leaves remote, recurved-spreading, serrate . A. Sullivantii, 159. 

 Leaves close. 



Costa excurrent, seta arcuate . .A. Californicum. 159. 



Costa vanishing below apex. 

 Entire . . . . . . .. ' -. A. Mougeotii, 159. 



Serrulate . . . . . .A. caespitosum, 160. 



ZYGODON. 8 



Capsule without a perisfome . . . . Z. yiridissimns, 207. 

 Capsule with double peristome . . . . Z. conoideus, 208. 



1 Including C. Renauldi Card., Bot. Gaz. 15: 41. 1890. 

 See appendix, no. 206. 



