LEAVES. 



63 



PLATE XXV. 



FIG. 35. Powdered Coca Leaves (x 240). 



cr, Prismatic crystals of calcium oxalate. 

 ei, Lower epidermis with surface view of papillose cells (pr). 

 e'f ', Lower epidermis in section. 

 -en, Epidermis over veins, surface view, 

 e'n', Epidermis over veins in section. 

 f, Pericyclic fibres, 



ffv, Fragments of vessels from midrib. 

 .1, Bast. 



me, Spongy parenchyma. 

 pa, Palisade cells with crystals, surface view. 

 p'a', The same in section. 



st, Stomata, with two cells parallel to the ostiole. 

 tc, Crystal cells. 

 tf, Cortical tissue of midrib. 

 tr, Small vessels. No hairs either simple or glandular. 



