POLYPORUS. 137 



P, albellus. Pk. 



Pileus, thick, sessile, convex or subungulate, subsolitary, 

 two to four inches broad, one to one and a half thick, fleshy, 

 rather soft, the adnate cuticle very thin, smooth or sometimes 

 slightly roughened by a slight stigose tomentum, especially 

 toward the margin, whitish, tinged more or less with fuscous ; 

 flesh pure white, odor acidulous. 



Pores, nearly plain, minute, subrotund, about two lines 

 long, white, inclining to yellowish, the dissepiments thin, acute. 



Spores, minute, cylindrical, curved, white, .00016 to .0002 

 inch long. — Peck" s Reports. 



Common on poplar logs throughout the Valley. 



P. borealis. Fr. 



White, then yellowish, 5 cent. (2 in.) and more broad and 

 thick. 



Pileus, spongy, then corky, compact, somewhat pulvinate, 

 hairy, internally composed of parallel fibres, margin spreading. 



Pores, adnate, unequal, sinuoso-flexuous and torn, white. 



This plant is quite common on oak stumps in Minesite woods. 



P. connatus. Fr. 



Pileus, corky and woody, efi"used, more or less imbricated, 

 confluent, velvety, white within and without. 

 Pores, minute, roundish, white. 

 Common at the base of living trees where there is some moss growing. 



Group 3. Inodermei. Pileus with a dry cuticle. 



P. versicolor. Different-colored Polyporus. 



Pileus, coriaceous, thin, rigid, plane, depressed behind, 

 velvety, even, and shining ; variegated with colored zones. 

 Pores, minute, acute, and torn, white, then pallid. 



