194 TIMBER AND SOME OF ITS DISEASES [chap 



mycelium of this fungus destroys the structure of the 

 wood in a manner so similar to that of the Mendius 

 that the sawyers and others do not readily distinguish 



Fig 34 —A piece of pme-wood attacked by the mycelmm of Polyporus vaJ>ofarins 

 The timber has warped and cracked under the action of the fungus, becoming of 

 a warm brown colour at the same time , m the crevices the white strands of felt like 

 m> cehum hive then increased, and on splitting the diseased timber thty are found 

 creeping and applying themselves to all the surfaces E'ccept that the colour li. 

 snowy white, instead of gray, thib mycelium may easily be mistaken for that of 

 MenUius Ihe fructmcation which it develops is, however, very different 

 (After R Hartig ) 



between the two The mycelium of Polyporus 

 vaporarms forms thick ribbons and strands, but 

 they are snowy white, and not gray like those of 



