PLATE 103 



10 



CROSS-SECTION OF UNROSSED WHITE PINE BARK (Pinus strobus, L.) 



i. Cork cells of the epidermis. 2. Parenchyma cells filled with chlorophyl. 

 3. Intercellular space. 4. Secretion cavity with resin. 5. Secretion cells. 

 6, One or more circles of parenchyma filled with chlorophyl. 7. Parenchyma. 

 8. Meduilary rays. 9. Sieve cells. 10. Storage cavities. 



