434 



DISEASES OF ECONOMIC PLANTS 



Soft heart rot (Polystictis versicolor (L.) Fr.). — The 

 wood at the center of the tree is discolored and dis- 

 integrated, becoming' eventually straw-colored and soft. 



Fig. 189. — Cross cut of cedar log showing effect of Polj-porus juniperinus. 

 After von Schrer.k. 



The sporophores appear near the wound which afforded 

 entrance. They are sessile, grouped, soft hairy above with 

 alternate bands of light and dark color. When old, they 

 are tough with edges curled in. See also p. 429. 



