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 . . . § IT. Folyclada, p. 173. 



Branches 3 — 6 in a fascicle, or fewer. 

 Hyaline cells of stem leaves flbrillose. 

 Cortical cells thin walled. 

 Border of stem leaves much broader at base, chloro- 



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

 Border of stem leaves not or slightly broader at the 



base §VI. Subsecunda, p. 173. 



Cortical cells thick walled .... §111. Cnspidata, p. 172. 

 Hyaline cells of stem leaves without fibrils. 

 Chlorophyllose cells of branch leaves exposed on 



inner face §1. Acntifolia, p. 171. 



[8, subsecwndtitn and 8, contorturn may be sought here.l 



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

 cluded. 

 CoU membranes of stem leaves resorbed. 

 Hyaline cells of branch leaves with few pores on 



the outer surface (4-6) . §11. Squarrosa, p, 172. 



Hyaline cells of branch leaves with numerous 



pores on outer surface (12-16+) . §T. Sigida, p. 1 73. 



Cell membranes of stem leaves not resorbed, cortex 



thick walled .... §111. Cnspidata, p.l72. 



