92 THE POLYPORACEAE OF WISCONSIN. 



The pores are medium, becoming lengthened, so that they equal the 

 thickness of the pileus, whitish, becoming pale straw-yellow on drying. 

 The dissepiments are thin and more or less toothed. 



Common on birch logs and alder. Specimens have been found at 

 Bangor on birch and alder; at Hazelhurst, Cudahy, Shanagolden, Lady- 

 smith and Star Lake. A few specimens were found at Sparta on an 

 old oak stump. 



The largest specimens measured 5 cm. in width, 6 cm. in length, and 

 8 mm. in thickness at the base. The tubes were as long as the thickness 

 of the pileus. The species is commonly infested by larvae. 



Syn. : Coriolus pubescens (Schum.) Murr. ; 19, 32, p. 645. 



Polyporus chioneus Fries. 



Pileus white, fleshy, soft, smooth, glabrate, azonate, frequently ex- 

 tended behind; the margin incurved; pores short, slender, round, 

 equal, dissepiments entire. 



When fresh and moist the whole fungus becomes hygrophanous, and 

 when dried specimens are thrown into water, they become swollen and 

 somewhat hyaline but not as brittle as are fresh specimens. When 

 dry they are soft and brittle. 



The species is quite common in wet weather, growing on sticks, old 

 logs and stumps. Localities: South Milwaukee, Horicon, Madison, 

 Blue Mounds, Crandon, Hazelhurst, Star Lake, Gliddon, Ladysmith, 

 Bangor and Sparta. The largest specimen measures about 9 cm. in 

 breadth, 8 cm. in length and 2 cm. in thickness. When dry they as- 

 sume a slightly alutaceous hue. 



The hygrophanous texture of the growing plant makes it quite dis- 

 tinct among the common white polypores. When dry, the light, soft 

 brittle substance, the regular pores and the smooth pileus distinguish 

 it. 



Polyporus caesius Schrad. 



White here and there with a bluish tinge. Pileus fleshy-soft, tena- 

 cious, unequal, silky. Pores small, unequal, long, and flexous, dentate, 

 lacerate. 



Morgan (18, VIII, p. 106) says that this species grows in the "woods 

 on sticks. Pilei % to iy 2 inches broad and long; simple, subimbricate 

 sometimes substipitate, color assumed by my specimens is bluish-gray. 

 Pores rather small become toothed and lacerate." 



