THE EUROPEAN SPHAGNACEE B49 
numerous pores on the inner surface of the branch-leaves, and by 
the completely enclosed chlorophyllose cells in the section of a 
branch-leaf; and from S. annulatum by the distinct stem-cortex, 
and the numerous pores on the inner surface of the branch-leaf. 
29. 8. mottuscum Bruch in Flora, 1825, 685. 
yn. 8S. tenellum (Ehrh.) Lindb. in Gifvers V.-Ak. Forh. 19, 
p- 142, No. 13 (1862). 
Exsicc. Braithw. Sphagn. Brit. Exsicc. Nos. 11 and 12. 
Tufts very soft, sometimes dense, sometimes looser; above grey 
or a beautiful yellow-green, rarely with the capitulum pale reddish ; 
when growing in water up to 25 cm. long; plants always very 
delicate. 
Stem-cortex of 2-3 layers, formed of narrow or medium-sized 
thin-walled, non-porose cells. 
Wood-cylinder whitish, greenish, or yellowish. 
Stem-leaves large, triangular-oval to almost lingulate, generally 
with the margin inrolled towards the weakly-toothed apex ; when 
dry shining; border rather wide, more or less widened below ; 
inner surface towards the apex with large pores or membrane-gaps 
es. 
ascicles Sometimes distant, sometimes very close together, of 
2-4 branches, either 1-2 branches spreading and the others pendent, 
or all spreading, all relatively short; leaves loosely or closely 
arranged all round the branch. Retort-cells of branches very large, 
Chlorophyllose cells in section triangular to trapezoid, inserted 
between the flat hyaline cells on the outer surface of the leaf, and 
here free, on the inner surface either completely enclosed by the 
h so. 
Polyoicous; male branches short and thick, later becoming 
elongated ; of a beautiful yellow or yellow-brown colour ; perigonial 
i i and structure. 
