VI.] 



POLYP OR US SULPHUREUS. 



167 



a warm brown colour and to undergo decay. In the 

 infested timber are to be observed radial and other 

 crevices filled with the dense felt-like mycelium formed 

 by the common growth of the innumerable branched 



FIG. 19. Piece of timber completely destroyed by P. sulphnreus, the mycelium of 

 which fills up the crevices as a white felt. (After Hartig.) 



filaments (Figs. 18 and 19). In bad cases it is possible 

 to strip sheets of this yellowish white felt-work out 

 of the cracks, and on looking at the timber more 

 closely (of the oak, for instance) the vessels are found 



