102 THE POLYPORACEAE 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. gtivus; 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 salignus 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 



