466 



FUNGOUS DISEASES OF PLANTS 



Fie. 232. FoMhs Ari>i..-i.\.ir; -\ ox HARD MAPLK: SMALL SI-K< I.MKNS 

 (Photograph by Geo. F. Atkinson) 



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

 tree (Fagns grandifolia) ten inches or more in diameter which is 

 not seriously affected. The fungus is also destructive to hard 

 maple (Acer saccharum), yellow birch (Be tula lute a), aspen (Popn- 

 lus trnniiloides), and certain oaks (Oncrcns spp.) in their ranges. 



