Fig. ^.Polyporus sulphureus. i, an entire fungus about one- 

 quarter nat. size ; 2, section through the same, showing the thick, 

 fleshy pileus at a, and the tubes, which have the cavity lined with 

 the hymenium, or spore-bearing surface, at 6; 3, a basidium bearing 

 four spores, x 300. 



