THE POLYPORACEAE OF WISCONSIN. 101 



Polyporus radiatus Sowerby. 



Pileus corky, coriaceous, rigid, radiately wrinkled; at first velvety, 

 tawny; afterward glabrate, ferruginous-brown; margin spreading, re- 

 pand. Pores minute, pallid silvery-shining, at length ferruginous. 



Common in the northern part of the state on old maple and elm logs. 

 Collected at Star Lake, Crandon, Ladysmith, Shanagolden, on maple 

 and elm logs, and at Bangor on broken alder trunks ; at Sparta on birch 

 trunks. 



Variable. Usually effuso-reflexed, imbricated and laterally conflu- 

 ent. The rigid pilei are reflexed about 1 to 3 cm. Those collected on 

 the alder at Bangor are flabelliform measuring about 3 cm. in width 

 and 3.5 cm. in length. The surface is rough, usually glabrate, tawny 

 yellow when young changing to ferruginous-brown. When dry they 

 are hard and brittle. 



The species may easily be known by the brown radiately-wrinkled 

 pileus and the silvery sheen of the pores when turned in the 

 light. Very closely related to P. aureonitens Pat, ; but it is harder and 

 duller in color. 



Syn. : Inonotus radiatus (Sow.) Karst. ; 13, 3, p. 19; 19, 31, p. 599. 

 PolysticHs radiatus (Sow.) Fr.; 8, p. 565; 26, VI, p. 247. 



Polyporus aureonitens Pat. et Pk. 



Pileus 6 — 18 cm. broad, rather thick, corky, sessile, variously concres- 

 cent and imbricated, minutely velvety-pubescent, when young, soon gla- 

 brate, radiately fibrous-striate, the young plant and growing margin at 

 first sulphur yellow, then golden tawny, finally tawny-ferruginous. 



' ' Generally concrescent, marked with darker lines or zones, somewhat 

 shiny, substance tawny ; pores minute, subrotund, short, ferruginous 

 with silvery lustre; spores whitish or very pale, yellowish, elliptical, 

 naviculoid, .2 x 1.6 microns. Birches, alder and maple. August and 

 September. Related to P. radiatus; but paler, lineate-zonate and pale 

 spores. ' ' 



Not common. A few small specimens were found near Mud Lake, 

 Crandon, on birch branches and stump. 



The specimens were much imbricated, hard, small, the largest being 

 about 3 by 2 cm. and 8 mm. in thickness. 



The specimens much resemble P. radiatus, but the margin is covered 

 by a band of bright golden yellow, shining like silk. 



This species, as well as the preceding, is placed by Saccardo in the 

 genus Polystictus, but is here retained in the genus Polyporus because 



