92 



BOTANY: PRINCIPLES AND PROBLEMS 



stem takes place through the lenticels (Fig. 43), small spots or 

 strips where the bark tissue is softer and looser than elsewhere. 



Terminal 

 Bud 



Lateral 

 Bud 



I: 



il ' 



-Internode 



Leaf 

 Scar 



Node 



«^-#L^'f Scar of 



Terminal 

 Bud 



Lenticel 



Bundle 

 Scar6 



Fig. 43. — A woody twig in winter condition {Horse-chestnut) . 



Other Stem Types. — The typical upright, foliage-bearing stem 

 has sometimes become radically modified for the performance of 



