102 THE POLYPOBACEAE OF WISCONSIN. 



of the tough and fleshy character of the pileus, which becomes hard and 

 corky. 



Polyporus cuticularis Fries. 



Pileus thin, spongy, fleshy, later dry, applanate, hirsute and tomen- 

 tose, rusty-brown becoming blackish, within loosely parallel-fibrous. 

 Margin fibrous-fimbriate, incurved. Pores longer than the thickness of 

 the flesh, small, rust-color. Imbricated pilei sometimes growing into 

 each other. Tomentum strigose or velvety, disappearing at length. 



"The pores in fresh specimens," says Morgan (18, VIII, p. 105), 

 "are cinereous-pruinose, glittering when turned in the light. Spores 

 very abundant, Indian yellow, 5.6 microns long." 



Not common. A group of specimens was found growing on a poplar 

 stump near Oak Center in July 1902. The pilei were very much imbri- 

 cated and at first were confused with those of P. gilvus; however, on 

 closer examination they appear quite different. 



The largest pileus is 7 cm. broad, 4 cm. long, and 2 cm. thick. The pilei 

 are plane above and convex below. The younger specimens are light- 

 tawny and covered with a velvety pubescence. When they get older 

 the pubescence becomes more hispid and the color becomes more fer- 

 ruginous. The margin is thin but incurved. The flesh is at first soft, 

 but becomes very hard. It is composed of fibers of a dark ferruginous 

 color. 



The pores are medium, irregular and long; the spores are produced 

 in abundance and soon cover the old pileus giving it the characteristic 

 yellow-rust color. 



Easily recognized by the plano-convex pileus, the hispid surface, and 

 the yellow-rust colored spores which always cover the lower pilei. 



Polyporus salii^ius Fries. 



Pilei imbricated, dimidiate, effused, kidney shaped, soft-leathery, ap- 

 pressed-hairy, whitish, depressed around the wavy, swollen margin or 

 furrowed. Pores delicate, close, lengthened, sinuous, white. 



On old willow trunks. 



Not common. A few specimens were found at Sparta on a willow 

 stump, and one small specimen was found at Star Lake on a poplar log. 

 The largest of these measured 6 cm. in width, 3 cm. in length and 6 mm. 

 in thickness. 



The specimens are usually imbricated and confluent ; gibbous, with a 

 concentric depression near the margin. When young the surface is 



