26: 



The epidermis of the lower surface (Fig. 16 C; Fig. 18 В 

 and i)), along the margin of the leaf, is almost exactly like 

 that of the upper; the stomata are absent from a broad band 

 along the middle, where the cells are elongated and narrow. 



The differentiation of the mesophyll is fairly distinct. The 

 palisade-cells, towards the apex of the leaf, are obliquely placed. 



Fig. 17. Saxifraga aizoides. 



The leaf: A, Transverse section. B, Longitudinal section. C. Spongy parenchyma. 

 {A, B,C w/i)- 



