26 THE SPHAGNACEZ OR PEAT-MOSSES OF 
Wison, in Bryologia Brit. (1855), arranged them somewhat 
as Bridel. 
1. Leaves obtuse, rounded, or elliptic. 
S. cymbifolium, compactum, molluscum, rubellum. 
2. Leaves acuminate, ovate or ovato-lanceolate. 
a. Leaves erecto-patent. 
S. acutifolium, fimbriatum, cuspidatum, contortum. 
aa. Leaves squarrose. 
S. sguarrosum. 
SULLIVANT, in his MJosses of the United States (1856), forms 
four groups, characterized by the relative position of the cells in 
the branch leaves, as seen in transverse section—a valuable 
distinction, no doubt, but far too minute and difficult of obser- 
vation to be of practical utility. 
1. Chlorophyllose cells entirely enclosed by the hyaline, and 
not reaching either surface of leaf. 
S. cymbifolium, compactum, contortum, Lescurit, tenerum, 
humile, cyclophyllum, sedoides. 
2. Chlorophyllose cells oval, reaching to both surfaces of leaf. 
S. sguarrosum, macrophyllum. 
3. Chlorophyllose cells triangular, placed between the hyaline 
at the concave or inner surface of leaf. 
S. acutifolium, fimbriatum, tabulare, molle. 
4. Chlorophyllose cells triangular, placed between the hyaline 
at the convex or outer surface of leaf. 
S. cuspidatum, Torreyanum. 
ScHImPER, in his monograph, divides the species into two 
groups—monoicous and dioicous—a plan of very little practical 
help, since it is of no use with plants in a barren state. The same 
arrangement is followed in the Synopsis Musc. Europ. ed. 1 
(1860). 
C. Harray, in the eighth edition of the Scandinavian Flora 
(1861), uses the stem leaves for this purpose, thus :— 
1. Apex of cauline leaf broad, strongly and distinctly fimbriate 
in its whole margin. 
S. cymbifolium, Angstrimii, Lindbergii, fimbriatum. 
2. Apex indistinctly fimbriate or lacerate. 
S. rigidum, squarrosum, subsecundum, teres. 
3. Apex with a few distinct teeth, not fimbriate or lacerate. 
S. acutifolium, Miilleri. 
