96 THE POLYPORAGEAE OF WISCONSIN. 



Polyporus resinosus (Schrad.) Fries (Plate XI, fig. 37). 



Pileus fleshy becoming suberose, flocculose-pruinose, rusty-fuscous, 

 the cuticle adnate, rigid, wrinkled, resinaceous ; within azonate, pallid ; 

 pores minute, equal, pallid. 



Quite common on various kinds of decayed logs especially basswood 

 and on living elm and maple. Specimens have been collected at Wau- 

 watosa, Horicon, Sparta, Elkhorn, Madison, Blue Mounds and Ban- 

 gor, Oakfield, Crandon, Hazelhurst, and Shanagolden. At Shana- 

 golden the specimens were found growing out of living maple and elm 

 trees, which had a diameter of from 37 to 45 cm. In these cases the 

 entire center of the trees was in such an advanced state of decay, that 

 the wood could easily be torn out with the hand. This decay extended 

 upwards iato the trunk for a distance of from 10 to 20 feet, and down 

 into the stump. The trees had a shell of sound sap-wood varying from 

 5 to 7.5 cm. in thickness. The pilei grew out through the so-called 

 frost-cracks in the wood, through which, possibly, infection took place. 



This is a large species. Largest specimen 45 cm. wide, 24 cm. long, 

 and from 3 to 4 cm. thick. Usually, however, the pilei are smaller. 

 When vigorously growing, the pilei exude a transparent, brownish, 

 tasteless liquid, which on drying on the finger is somewhat sticky. 



Peck (22, 33, p. 21) says it closely resembles P. ienzoinus Wallr., 

 which occurs on hemlock trees while P. resinosus occurs on frondose 

 trees. P. benzoinus has an odor like Trametes odorata, and is probably 

 only a subspecies of P. resinosus. P. rubiginosus is hardly different, 

 but it is tomentose instead of fiocculose-pruinose, and the pores are cin- 

 namon. 



The species may be known by its large size, rusty-brown cuticle, ru- 

 gosely wrinkled when dry, the pallid, brittle substance and the pale 

 liquid oozing out of the growing margin and pores. 



Polyporus delectans Pk. 



White, becoming yellowish. Pileus fleshy-fibrous, firm, simple or 

 subimbricate, azonate, subtomentose. Pores large, unequal, at first sub- 

 rotund and obtuse, then thin, angular and dentate. 



"In woods on fallen trunks; common. Pileus two to four inches in 

 breadth, with a projection of one to two inches, or, confluently, several 

 inches in width. The stratum of pores is about half the thickness of 

 the pileus." (Morgan 18, VIII, p. 128). 



