158 TIMBER AND SOME OF ITS DISEASES. [CHAP. 



slightly unhealthy) gave a hollow sound when struck, 

 and the foresters told me that nearly every tree was 

 rotten at the core. I had found the mycelium of 



FIG. 16. Sketch of the base of a young tree (s), killed by Agaricus melleus, whicL 

 has attacked the roots, and developed rhizomorphs at r, and fructifications. To 

 the right the fructifications have been traced by dissection to the rhizomorph 

 strands which produced them. 



Agaricus melleus in the rotting stumps of previously 

 felled trees all up and down the same valley, but it 

 was not satisfactory to simple assume that the " rot " 



