THE POLYPORACEAE OF WISCONSIN. 47 



Poria gordoniensis B. & Br. 



Effused, membranous, very thin, separable, persistently white; 

 margin shortly fimbriate, pores minute, unequal, angulate; dissepi- 

 ments very thin, fimbriate-dentate. 



One lot of specimens of this very small fungus was collected at 

 Parfrey's Glen. The largest pileus is about 1cm. in diameter, very 

 thin and delicate. The margin is fimbriate, white; the pores scarcely 

 visible to the naked eye, shallow, angulate. 



The whole plant has a waxy, white appearance. It grows on very 

 much decayed wood. 



Poria vitellina Schw 



Widely effused, loosely adnate, thick, uneven, soft and fleshy, vi- 

 telline, with a byssine margin. Pores very large, elevated, unequal, 

 thin, angular. 



Morgan (18, VI, p. 175) says of this species: "A soft and fleshy 

 fungus of unequal thickness and large and unequal pores. The color 

 is very elegant and persists even in drying. The egg-yellow pervades 

 the whole mass. The long pores vary from round to angular and 

 even sinuous. Strings of yellow mycelium penetrate the rotten wood be- 

 neath. ' ' 



Specimens from the underside of sidewalks at Madison are not 

 quite as thick as described for the species ; the margin is thin and cob- 

 webby, like that of Polyporus bombycinus. Specimens from Horicon 

 on poplar are perhaps more typical. 



The whole substance is soft-brittle. The pores are thin-walled, 

 nearly 3 mm. long with a diameter of about 0.75 mm. 



The species looks very much like Polyporus bombycinus and like 

 the large-pored forms of Poria mollusca. 



Poria radula (Pers.) Fr. 



Effused, thin, white, formed entirely from the loose, dry mycelium, 

 villous below; pores medium sized, angular, dissepiments toothed, 

 pubescent when young. 



One specimen was found growing on the under side of a box in the 

 greenhouse at the University of Wisconsin. The whole bottom of the 

 box was covered by strands of dryish nocculose white mycelium which 



