Genus St at ice as represented at Blakeney Point. I. 275 
this plant consist of one long and one shorter layer of cells (Text-fig. 23, b) 5 
and it is intermediate in this respect between its possible parents (cf. Text- 
fig. 23, A, B and c). 
It is in the surface of the axis, however, that the chief difference occurs. 
In the tall and dwarf forms of binervosa it is quite smooth, except in the 
ultimate branchings. In the ? hybrid all the branches are slightly rough, but 
in bellidifotia the scape is distinctly granulated throughout. The rough 
Text-fig. 23. Part of the inflorescence axis of S. 
bellidifolia (c), narrow-leaved binervosa (a), broad-leaved 
binervosa (b) (taken from comparable levels). x 347. 
0 c. = external cuticle ; i.c. — internal cuticle ; p. = pali- 
sade ; a.s. = assimilating layer. 
Text-fig. 24. a. Gland in surface view from 
the inflorescence axis of S. bellidifolia. x 293. 
B. Part of the epidermis showing one of the rosette 
cells. x 220. r. = rosette of enlarged cells; 
g. = gland ; s. — stoma with four subsidiary cells; 
c. Stoma of S. binervosa with its three subsidiary 
cells, x 165. 
appearance is due to the fact that the epidermal cells surrounding a gland 
are considerably enlarged and papillate, resulting in the sinking of the 
gland in a depression, while the glands in surface view appear as rosette-like 
structures. This is clearly shown in Text-fig. 24, A. 
The slight wartiness of the axis of the broad-leaved form is due to 
a similar, though less pronounced, arrangement of the cells surrounding the 
gland (cf. A and B, Text-fig. 25). 
In all the other forms of binervosa , though an occasional enlargement 
