EUROPE AND NORTH AMERICA. 29 
CLAVIS TO THE SPECIES HERE DESCRIBED. 
SPHAGNUM. 
Sect. I.—Evuspuacnum, Lindb. 
Branches dimorphous, part divergent, part pendent ;_ their 
leaves with spiral fibres. Capsule oblong, small-mouthed. 
A. Cymbtfolia, Cuticular cells fibrillose. Branch leaves cym- 
biform-concave, the apex cucullate, squamoso-scabrous at 
back. 
Branch leaves with the lateral wall of the combined 
hyaline and chlorophyllose cells covered with papille. 
Branch leaves minutely fringed all round the margin. 
Portoricense. 
Branch leaves not fringed. 
Chlorophyllose cells trigonous, emerging on the con- 
cave surface of leaf. Papillz transverse, in a 
single series. Austini, 
Chlorophyllose cells lenticular, entirely enclosed by 
the hyaline. Papille wart-like, numerous, scattered. 
papillosum. 
Branch leaves with the lateral wall of the combined hyaline 
and chlorophyllose cells smooth. cymbifolium. 
B. Sudsecunda. Branch leaves more or less secund, ovate, 
with rounded toothed points; the margin involute in 
the upper half. 
Retort cells of branches large, curved outward at apex. 
Hyaline cells of branch leaves large. tenellum, 
Retort cells of branches small, cylindric. Hyaline cells of 
branch leaves small. 
Cuticular cells of stem in a single layer. sudsecundum. 
Cuticular cells of stem in 2-3 layers. laricinum. 
C. Truncata. Branch leaves oblong, the point truncate, 
strongly toothed, margin involute for all its length. 
Stem leaves very small, tongue-shaped ; branch leaves 
ovate-oblong, toothed at apex. rigidum. 
Stem leaves truncate, many-toothed ; branch leaves 
broadly ovate, acuminate, with 6-10 teeth. 
A. ngstromit. 
Stem leaves very large, ovato-lanceolate, 3-toothed ; 
branch leaves ovate-oblong, 3-5 toothed. molle. 
