LEAF STRUCTURE 



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transverse section (Plates 62, 63), the epidermal 

 membrane will be found to consist of rectangular or 

 polygonal, thin-walled, colorless cells fitting tightly- 

 together with practically no intercellular spaces. 



Plate 62. — Leaf Structure. 



Transverse Section, Oleander Leaf. 1. Upper epidermis. 2. Subepidermal or 

 hypodermal layer. 3. Palisade cells. 4. Mesophyll or leaf parenchyma. 5. Lower 

 epidermis. 



The exposed wall of the epidermal cell may show more 

 or less thickening, or may be further modified to form 

 glandular or non-glandular trichomes. Occasionally 

 a subepidermal or hypodermal layer of cells (Plate 



