. BABNES NOETH 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 net fringed. 



Walls of the hyaline cells adjoining the chlorophyllose 



cells furnished with a fringe of fibrils . S. imbricatum, 1 21. 

 Walls of the hyaline cells adjoining the chlorophyllose 



cells thickly papillose . . . . . S. papillosnm, 21. 

 Walls smooth S. cymbi folium, 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, 23a. 



Chlorophyllose cells included, wood cylinder red . S. medium, %4a. 

 Cortical cells not fibrillose .... S. Ludoyicianum, 25. 



ANDRE^EA, p. 25. 



I. Leaves ecostate. 

 Leaves papillose beneath. 

 Margin hyaline. 

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



cose A. parrifolia, 26. 



Leaves spreading or secund, acuminate, not ventri- 



cose A. petrophila, 25. 



Leaves spreading, obtuse, short-pointed . . A. papillosa, 27. 



Margin not hyaline A. alpestris, 28. 



Leaves not papillose, upper leaf -cells rhomboid . . A. oboyata, 29. 



II. Leaves costate. 



Perichaetial and comal leaves different. 



Costa vanishing below apex A. rupestris, 25. 



Costa excurrent. 

 Subula papillose. 



Costa filling all the subula . . . A. erassinerria, 25. 



Costa filling half the subula . . . .A. Huntii, SO. 



Subula smooth . . . . . . A. Blyttii, 31. 



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



