PLANTS, FUNGI AND INSECTS 



Portion of Transverse Section of Young Stem* 



cor, cortex ; end, endodermis ; pe, 

 pericycle; ph, phloem; cb, cambium; 

 xy, xylem; p, pith; m, medullary 

 ray. 



Section through Lenticel (highly magnified). 



A . Bark, made up of crushed cork. 



B. Cork. 



C. Cork cambium. 



D. E, F. Layers of regular cork. 



G. Cork which will break up into spongy 

 cork when lenticel has developed further. 



H. Spongy cork. 



K. Broken layers of cork cambium and 

 cork, forced out by growth of lenticel. 



Diagram of Plum Branch 

 showing Lenticels (natural 

 size) . 



FIG. 2. THE STEM. 



1 Reproduced, by permission, from Johnson's Text Book of Botany. 



