556 



SPECIAL PLANT PATHOLOGY 



Fig. 200. — Cross-section of a living aspen tree rotted by Fames igniarius. (After 

 von Schrenk, Hermann, Bull. 149, U. S. Bureau of Plant Industry, pi. ii, 1909.) 



Fig. 201. — Cross-section of a living white oak tree decayed by Hydnum eri- 

 naceus. (After von Schrenk, Hermann, Bull. 149, U. S. Bureau of Plant Industry, 

 pi. vii, 1909.) 



