ILLUSTRATING LEAF 

 STRUCTURE 



The leaf at the left presents the under 

 surface and that at the right the upper 

 surface. It will be seen that the upper 

 surface is more smooth and glossy, in 

 contrast with the more clearly ribbed 

 and reticulated lower surface. The all- 

 important stomata, or breathing pores, 

 are largely located on the lower side of 

 the leaf. 



