SAPROPHYTIC FUNGI OF EASTERN IOWA. 23 



out, when growing soft, when dry suberose. In size from 

 4-6 cm long by 8-12 wide. Habitat oak trees, especially 

 standing trunks of young bur-oaks that have been killed by 

 tire, in which case the pileus almost surrounds the trunk. 



4. PoLYPORUS GALACTiNus Berkeley. 



Pileus dimidiate or reniform, fleshy, uneven, strigose-tomen- 

 tose, wdiitish, within zonate-fibrous, effused behind; the hymen- 

 ium explanate or slightly concave; the margin thin; the pores 

 small, scarce visible to the naked eye, silky- whitish; dissepi- 

 ments very thin. 



On rotting logs, usually near the ground, not common. 

 x\t first white and soft, but dr^-ing very hard and tough, 

 the margin incurving. The pores are very small and w^hen 

 dry have a peculiar flesh-tint not observed elsewhere. Our 

 specimens are obscurely marked by numerous concentric 

 furrows. Sometimes resupinate. 



5. POLYPORUS DICHROUS J^J'/eS. 



Pileus fleshy soft, thin, effused, reflexed, smooth, silky, 

 white; the margin concolorous, straight; pores short, small, 

 round, fuscous-cinnamon, obtuse. 



A small, rather delicate species. Our specimens belong to 

 the variety nigro-fiiyftirascens Schw., the pores when fresh 

 ■dark purplish, only towards the margin brownish. Usually 

 about I cm long but extending and effused for a much greater 

 distance. Sometimes flabelliform and as if cespitose. 



6. PoLVPORUs ADUSTUS ( WiJIdeuozu^ Fries. 



Pileus fleshy, soft, thin, villous, ashy-pallid, effused-reflexed 

 behind; margin straight, blackening; pores small, short, round, 

 ■obtuse, from whitish-pruinose presently ashy-fuscous, the 

 inarginal obsolete. 



Very common especially on fallen stems of species of Pop- 

 iihis. Our specimens are not villous, unless when 3'oung, 

 generally soft velvety or pulverulent. Easily recognized by its 

 habit, widely effused or resupinate, and by the peculiar slaty 

 color of the hymenium. Very near the next species in some 



