462 



FUNGOUS DISEASES OF PLANTS 



VIII. POLYPORUS: OTHER SPECIES 



In addition to the species described at length, the following 

 may be mentioned also as among those of special importance, 



Fig. 228. Polyporus borealis on Living Tsuga. (Photograph by 

 Geo. F. Atkinson) 



occurring in Europe and in America, which have received more 

 or less recent consideration from the standpoint of shade and 

 forest tree diseases. 



