THE POLYPOBACEAE OF WISCONSIN. 47 



Poria gordoniensis B. & Br. 



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

 margin shortly fimbriate, pores minute, imequal, 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 1 cm. 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 flocculose white mycelium which 



