243 



w'dh 5 — 7 lobes. Each lobe terminates in a hydathode (Fig. 1 ^4). 

 Along the margin and upon both surfaces glandular hairs occur, 

 long upon the upper surface and short upon the lower (Fig. 2 E.) 



C 



Fig. 1. Saxifraga cernua. 

 A ('s), Leaf-form. B, Upper epidermis with a glandular hair. C, Transverse section of 

 leaf. D, Longitudinal section of leaf-apex with hydathode. E, Spongy parenchyma. {B, 



C, D and E »o/i). 



The epidermis of the upper surface consists of cells with un- 

 dulating walls (Fig. 1 B), the lateral and outer walls of which are 

 thin (2 — 3«). Cuticle is very slightly developed. The epidermis of 

 the upper surface is provided with stomala which project above 



