PLATE 55 



LEAF EPIDERMI WITH STOMA 



1. Under epidermis of coca leaf (Erythroxylon coca, Lam.) with stoma on 

 a level with the surface. 



2. Under epidermis of false buchu (Marrubium peregrinum, L.) with stoma 

 below the level of the surface. 



3. Upper epidermis of deer tongue (Trilisia odoratissima, [Walt.] Cass.) 

 with stoma above the leaf surface. 



