ANALYTIC KEY 



TO THE 



SPECIES OF MOSSES 



SPHAGNUM, p. 12. 



I. Cortical cells of stem and branch without spiral fibrils; branch 

 leaves mostly blunt and toothed, rarely acute . 



Branches 7 13 in a fascicle . . . IV. Polyclada, p. 173. 



Branches 3 6 in a fascicle, or fewer. 

 Hyaline cells of stem leaves fibrillose. 

 Cortical cells thin walled. 

 Border of stem leaves much broader at base, chloro- 



phyllose cells exposed on the inner face 1. Acutifolia, p. 171. 

 Border of stem leaves not or slightly broader at the 



base ... . . . TI. Snbsecunda, p. 173. 



Cortical ce) Is thick walled . . . . 111. Cuspid ata, p. 172. 



Hyaline cells of stem leaves without fibrils. 

 Chlorophyllose cells of branch leaves exposed on 



inner face v 1. Acutifolia, p. 171. 



[S. subsecundum and -8. contortunt, may be sought here.} 



Chlorophyllose cells exposed on both faces, only on outer face, or in- 

 cluded. 



Cell membranes of stem leaves resorbed. 

 Hyaline cells of branch leaves with few pores on 



the outer surface (4-3) . . 11. Sqnarrosa, p. 172. 

 Hyaline cells of branch leaves with numerous 



pores on outer surface (12-16+) . . T. Rigida, p. 173. 

 Cell membranes of stem leaves not resorbed, cortex 



thick walled . . . . 111. Cuspidata,p.l72. 



