TBEES AND TIMBER 417 



with the upper surface in early stages a bright orange-red ; 

 later they are sulphur-yellow both above and below. The 



Fig. 179. ^ Polyporus sulphureus showing effect upon wood of oak tree. After von 



Schrenk. 



upper surface when bruised is brown. The sporophore is 

 soft and fleshy when young, growing harder with age until 



2 E 



