BARNES — NORTH AMERICAN MOSSES. 201 



Alar cells of leaf quadrate . . . . R. micropus, 199. 

 Annulusnone R. speciosum, ^Oi. 



COSCINODON, p. 154- 



Costa not entering the hyaline point, which is less than 

 the leaf in length. 

 Dioicous, leaves oblong lanceolate . . . C. pulvinatns, 154. 



Autoicous, leaves obovate C. Raui/ 155. 



Costa forming a rough hyaline point twice as long as the 



leaf C. Wrightii, 155. 



PTYCHOMITRIUM, p. 156. 



Plants large (3 cm. +), leaves acuminate, sharply dentate P. Gardner!, 156. 

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

 quite entire. 

 CoUum none. 

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

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

 CoUum equalling one-third sporangium . . .P. pygiuaeum, 157. 



AMPHORIDIUM, p. 158. 



Leaf margins plane, entire A. Lappouicam, 158. 



Leaf margins recurved or revolute. 

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

 Leaves close. 

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

 Costa vanishing below apex. 



Entire A. Mougeotii, 159. 



Serrulate A. csespitosum, 160. 



ZYGODON.a 



Capsule without a peristome . . . . Z. Tiridissimus, S07. 

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



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

 s See appendix, no. 206. 



