THE POLYPORAOEAE OF WISOONSIN. 87 



n. POLYPORUS. 



The chief characteristics of this genus are as follows: Central or 

 lateral stemmed, or sessile. Pileus fleshy, tough, rather soft and moist, 

 at length becoming harder; neither sulcate nor zoned externally, but 

 the internal texture consisting of radiating fibres, often more or less 

 zoned. Pores never stratose but forming an inseparable distinct stra- 

 tum. A few species of this genus are edible. 



KEY TO THE WISCOITSIN SPECIES OF POLTPOBUB 



Dimidiate or sessile 1 



Cespltose 2 



Stlped 3 



1. Flesi white 4 



1. Mesh, yellowish to ferruginous 5 



1. Flesh reddish-orange 6 



4. Tuhes smoke to sooty P- adustus 



4. Tuhes faintly smoky P. fumosus 



4. Tuhes scarcely smoky, fragrant P. fragrana 



4. Tuhes whitish, not fragrant P. puiescens 



4. Tuhes whitish, pileus very moist P. chioneus 



4. Tuhes whitish, turning hlulsh when hruised P. caesius 



4. Tubes whitish, pileus grayish P. scrdidus 



4. Tuhes whitish, turning hrown when bruised P. fragilis 



4. Tuhes whitish, pileus tomentose P. lacteus 



4. Tuhes whitish, pileus thick, hirsute P. spumeus 



4. Tuhes whitish, pileus tough, strlgose P. borealis 



4. Tuhes whitish, pileus hrown P. resinosus 



4. Tubes whitish, large, pileus fleshy-flhrous P. delectans 



4. Tuhes whitish, pileus hoof -shaped P. stiptious 



4. Tuhes whitish, turning pinkish when bruised P. guttulatus 



4. Tuhes whitish, not turning pinkish, suhcespltose P. epileuous 



4. Tuhes whitish, pilel grayish, suhcespltose P. tephroleucus 



5. Flesh yellowish hrown P. gilvus 



5. Flesh ferruginous, soft P. nidulans 



5. Flesh ferruginous, hard P. radiatus 



5. Flesh ferruginous, pileus golden P. aureonitens 



'5. Flesh ferruginous, pileus cuticulate P. cuticuTans 



6. Pores large P. aurantiacus 



6. Pores smaller P. Pilotae 



2. Scarcely cespltose, white P. salignus 



2. Scarcely cespltose, small P. floriformis 



2. White, heavy p. osseus 



2. Alutaceous, fleshy to leathery p. distortus 



2. Yellow p. sulfureus 



2. Grayish-white, frondose p. frondosus 



