vi. J POLYPORUS SULPHUREUS. 165 



One of the commonest of these is Polyporus sul- 

 phureus (Fig. 17), which does great injury to all kinds 

 of standing timber, especially the oak, poplar, willow, 

 hazel, pear, larch, and others. It is probably well 



FIG. 17. Polyporus sulphnreus : portion of the fungus springing from a piece of bark. 

 (After Hartig.) 





known to most foresters, as its fructification projects 

 horizontally from the diseased trunks as tiers of 

 bracket-shaped bodies of a cheese-like consistency ; 

 bright yellow below, where the numerous minute pores 

 are, and orange or somewhat vermilion above, giving 



