556 



SPECIAL PLANT PATHOLOGY 



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

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



Fig 201. — Cioss-scction of a li\ ing wIiul wak tu'o dct.ued b> Hydnum eri- 

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

 pi. vii, 1909.) 



