COOPER 



A. Quercus durata: cross-section of mycorhizal rootlet; note the thick external felt of 



mycelium, and the hypha penetrating between the cells of the cortex. X 170. 



B. Adenostoma fasciculalum: cross-.section of normal leaf. X 75. 



C. Adenostoma fasciculalum: cross-section of leaf from stump sprout. X 70. 



D. Adenostoma Jasciculatum: cross-section of leaf from seedling. X 70. 



