BARNES — NORTH AMERICAN MOSSES. 



175 



VII. Cymbifolia. 



A. Chlorophyllose cells of branch leaves exposed on the inner face. 



Branch leaves minutely fringed all around . S. Portoricense, 22. 



Branch leaves not fringed. 



Walls of the hyaline cells adjoining the chlorophyllose 



cells furnished with a fringe of fibrils . S. imbricatum,^ 21. 



Walls of the hyaline cells adjoining the chlorophyllose 



cells thickly papillose S. papillosum, 21. 



Walls smooth S. cymlbifolium, 21. 



B. Chlorophyllose cells of branch leaves exposed on both faces or 



included. 

 [S, cymbifolium may be sought here.] 



Cortical cells with fibrils. 



Chlorophyllose cells free on both faces, wood-cylinder 



dark-brown to black S. Waghornei, £Sa. 



Chlorophyllose cells included, wood cylinder red . S. medinm, ^4a. 

 Cortical cells not flbrillose .... S. Ludovicianum, S/>, 



ANDRE.£A, p. 25. 



I. I/eaves ecostate. 

 Leaves papillose beneath. 

 Margin hyaline. 

 Leaves incurved, minute, rotund obtuse, bi-ventri- 



cose A. parTifolia, S6. 



Leaves spreading or secund, acuminate, not ventri- 



cose A. petrophila, 25. 



Leaves spreading, obtuse, short-pointed . . A. papillosa, S7. 



Margin not hyaline A. alpestris, S8. 



Leaves not papillose, upper leaf-cells rhomboid . . A. obovata, g9. 



II. Leaves costate. 



Perichaetial and comal leaves different. 

 Costa vanishing below apex 

 Costa excurrent. 

 Subula papillose. 



Costa filling all the subula 

 Costa filling half the subula 

 Subula smooth ...... 



A. rnpestris, 25. 



A. crassinerria, 25. 

 A. Huntii, 30. 

 A. BIyttii, Si. 



1 8. Austini SuU., L. & J. Man. 21. 



