— 251 — 
the plant the leaves become narrower with the spine longer; 
the uppermost leaves as well as the leaves of the rosettes 
are sessile and acicular as in the previous species. The leaf 
is not ribbed as in A. minus but the structure of the green 
tissue is almost the same. The veins have a thick bast- 
mm \ / 4 
N 
ny oye 
N | 
X/ 
11 7 
1 till! Re ER À 
Xu LD | 4 MNL US 
Fig. 73. Agriophyllum minus. A, Transverse section 
of leaf, showing the distribution of sclerenchyma (black), 
palisades (striped) and veins (N). B, Detail of A; N, 
Veins (A, X 53; B, X 203). 
sheath and a strand of bast runs along the margin. The 
stem (fig. 75) has thick hypodermal ribs of sclerenchyma 
and is better provided with green tissue than the previous 
species. Lying within the palisade tissue there is a layer of 
storage cells interrupted by the bast-bundles of the leptome. 
