96 THE OAK 
lets clothed by a fungus mycelium; the mycelium is 
found asa thin sheet of closely-woven hyphe continuous 
over the whole of the tip, and sending processes in 
between the cells of the dermatogen, but not into the 
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Fie. 25.—Longitudinal section of the tip of one of the 
roots marked m in fig. 7, the outer layers of which are 
infested with fungus hyphe, /(mycorhiza); 7.c, root- 
cap; m, embryonic tissue from which all originates; P, 
pith; sp, spiral vessels of the primary xylem; «¢, cortex. 
cavities of the cells nor deeper into the tissues. Loose 
hyphee also radiate into the soil around, and often simulate 
the root-hairs of other plants, which, in fact, they are 
