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. 
