j8 natural history bulletin. 



Rarely collected, probably because it is overlooked as being' 

 no more than P. applanatus with which it has a general 

 resemblance. The cuticle is similar but more deeply colored ^ 

 the context is the same in structure but softer, the pores are 

 identical in size, length, coloration. The difference lies prin- 

 cipally in the mode of stratification. Both are stratose, the 

 present species rarely and then only by an innovation of the 

 h3'menophore, so that ths suc::e33ive strata are separated 

 even by the crust that is so characteristic of the genus. 



2. Fo.MES RiMOsus Bcvkchy. 



Pileus woodv. very hard, pulvinate-ungulate from annual 

 strata, at length rimose. sub-umbrine. deeply sulcate, the 

 growth of the year velutine-pruinate. cinnamon; context very 

 hard, fibrous; pores very long, thin, fulvous-ferruginous with 

 the mouth indistinct, darker. 



Not common. Easih' recognized by its checked and deeply 

 sulcate surface, which, when weathered looks dead and black. 

 Found mostly on oak, about 6-8 cm in width and half as thick, 

 indistinctly stratose. the annual increment marked rather by 

 the deep concentric furrows. A fungus of wide range, from 

 Australia to Iowa. 



3. FoMEs iGNiARius [Lijuiceus) Juries. 



Pileus at first tuberculose-globose with a thin light cover- 

 ing, appressed-flocculose. canescent. then ungulate. blackening; 

 the margin rounded; the context zonate. ferruginous; pores 

 very small, convex, stratose, cinnamon, at maturity white- 

 stuffed, at first canescent. 



Somewhat like the preceding in outward appearance, check- 

 ing and cracking with age, but much more slowly developed; 

 the pores comparatively short, about four mm and much more 

 deeply colored, dark cinnamon brown, P. rimosus having a 

 rhubarb tint.^ The white-stuffed pores almost all continuous 

 from year to year is another distinguishing character. Very 

 common on various trees, especially on oak, where it forms 

 hard discoidal excrescences, often quite symmetrical. This 



1 This species is also a Mucronoporus; see note under Polyporus gUvus. 



