256 



Fig. 10 A and В) has undulating walls which are thin everywhere. 

 The outer walls are also thin, and have a distinct cuticle. 

 Stomata are numerous, uniformly distributed, and prominent. 



Fig. 9. Saxifraga stellaris. 

 л (2/i), Leaf-form. B, Epidermis of the upper surface of the leaf. C, Transverse section 

 ^ of leaf. D, Longitudinal section of leaf. E, Spongy parenchyma. (B, C. D and E so/i). 



Glandular hairs occur scattered over the whole leaf-blade; a 



definite head is wanting to some of the marginal hairs (Fig. 9). 



The epidermis of the lower surface (Fig. 10 С and D) closely 



