SPORES HYALINE. 



plant to Fistulina hepatica, but the resemblance is not very close. 

 Mrs. Hussey states the flesh is intensely bitter. 



Although Fries places Polyporus quercinus in Section Apus, it 

 always has a stem, and should have been included in my pamphlet on 

 Stipitate Polyporoids. In my specimen the stem is two inches long. 

 A stem is shown on every figure that exists. 



ILLUSTRATIONS. Krombholtz t. 5, f. 3 and 5, and t. 48, f. 11-14; Hussey Ser. 1, t. 52; 

 Boudier, t. 154. All are good, but Boudier's figure is, of course, the best. The pore mouths, however, 

 naturally are white, but when handled or old they become the color of Boudier's figure, which, as to 

 the pore mouths, was evidently drawn from a discolored specimen. 



Compare fusco-pellis. 



SECTION 81. CONTEXT AND PORES WHITE, OR PALE, FLESH 

 FRAGILE, CRUMBLY. 



(Sections 81 to 87 have no distinct crust.) 



Fig. 637. 



Polyporus immaculatus. 



POLYPORUS IMMACULATUS (Fig. 637). Pileus triquetrous, 

 usually thick, an inch or more. Surface white, dull, smooth, anoderm, 

 fragile. Context soft, white, fragile, crumbly. Pores minute, round, 

 white. Spores 1x5, allantoid, cylindrical, curved. 



This is a tropical species, both of the American and Eastern 

 tropics. It is found in Cuba, South America, Africa, New Guinea, 

 and Philippines. The entire plant is pure white, and reminds one of 



299 



