332 MANUAL OF TREE DISEASES 



rays destroyed. Later the heartwood is decayed and becomes 

 brownish. The fruiting-bodies of the causal fungus are large, 

 white, fleshy structures formed on the ground. They are 

 attached to the diseased roots by long tuber-like stalks. 

 Further details concerning this root-rot will be found under 

 fir diseases, on page 170. 



