PLATE loi 



A. Cross-section of buchu stem {Barosma betulina [Berg.], Barth. and 

 Wendl.). I, Outer wall of epidermis; 2, Cell cavity of epidermal cell; 3, Wall 

 of cork cell; 4, Cavity of cork cell; 5, Phellogen layer; 6, Divided phellogen 

 cell changing into a cortical parenchyma cell; 7, Cortical parenchyma cell. 



B. Cross-section of leptandra rhizome {Leptandra virginica [L.], Nutt.). 

 I, Parenchyma cells undergoing change in the composition of their walls; 2, A 

 break in the epidermal tissue; 3, Parenchyma cells undergoing division. 



