466 



FUNGOUS DISEASES OF PLANTS 



FlG. 232. FOMES APPLANA TUS ON HARD MAPLE: SMALL SPECIMENS 



(Photograph by Geo. F. Atkinson) 



trees. In the moist forest it is often difficult to find a beech 

 tree (Fagus grandifolid) ten inches or more in diameter which is 

 not seriously affected. The fungus is also destructive to hard 

 maple (Acer saccharum), yellow birch (Betula luted], aspen (Popu- 

 lus tremuloides\ and certain oaks (Quercus spp.) in their ranges. 



