24 
Wisconsin Academy of Sciences, Arts and Letters. 
ANALYTIC KEYS 
TO THE 
SPECIES OE MOSSES. 
SPHAGNUM, 1 * p. 12. 
I. Branches dimorphous, some divergent, some pendent; hyaline cells with 
fibrils. 
A. Chlorophyllose cells near one face of leaf, triangular, triangular- 
elliptical or trapezoidal in transverse section. 
1. Chlorophyllose cells on the ventral face of leaf; hyaline cells most 
convex on the dorsal face. 
a. Branch leaves minutely fringed all around . S. Fortoricense, 22. 
I). Branch leaves not fringed. 
Walls of hyaline cells adjoining chlorophyllose cells fur¬ 
nished with a fringe of rudimentary fibrils . . S. Austini, 21. 
Walls of hyaline cells adjoining chlorophyllose cells thickly 
papillose.S. papillosum, 20* 
Walls smooth. 
Cortical cells of stem fibrillose. 
Chlorophyllose cells narrowly triangular or triangular 
elliptical. S. cyniMfolium, 19* 
Chlorophyllose cells very large, equilateral-triangular . S. affine 
Cortical cells porose, not fibrillose. 
Stem leaves broadest at base . S. acutifolium, 1. 
[S. Wulfianum may be sought here.] 
Stem leaves broadest in the middle .... S. molle, IS. 
Stem leaves broadest at apex.S. fhnbriatum, 4. 
Stem leaves of almost equal breadth throughout S. Grirgensohnii, 3 3. 
1 See Cardot: Revision des Sphaignes de l’Am^x’ique du Nord, in Bull. Soe. roy. de hot. d© 
Belgique, XXVI. 
3 Renauld & Cardot: Rev. Bryol. 1885, p. 44. See also Cardot: Sphaignes d’Europe in 
Bull. Soc. roy. de hot. de Belgique, XXV, p. 51, pi. .3, fig. 9 and 10 and pi. 3, fig. 5. 
8 S. strictum Lindb. 
