

A 



^ 



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



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



B. AdenoatomafasciLulaliun: cross-section of normal leaf. X 75. 



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



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



