THE POLYPORACEAE OF WISCONSIN. 87 



n. POLYPORUS. 



The chief characteristics of this germs 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 WISCONSIN SPECIES OF POLYPOBUS 



Dimidiate or sessile 1 



Cespitose 2 



Stiped 3 



1. Flesh white 4 



1. Flesh yellowish to ferruginous 5 



L Flesh reddish-orange 6 



4. Tubes smoke to sooty P. adustus 



4. Tubes faintly smoky P. fumosus 



4. Tubes scarcely smoky, fragrant P. fragrans 



4. Tubes whitish, not fragrant P. pubescens 



4. Tubes whitish, pileus very moist P. cMoneus 



4. Tubes whitish, turning bluish when bruised P. caesius 



4. Tubes whitish, pileus grayish P. sordidus 



4. Tubes whitish, turning brown when bruised P. fragilis 



4. Tubes whitish, pileus tomentose P. lacteus 



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



4. Tubes whitish, pileus tough, strigose P. borealis 



4. Tubes whitish, pileus brown P. resinosus 



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



4. Tubes whitish, pileus hoof -shaped P. stipticus 



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



4. Tubes whitish, not turning pinkish, subcespitose P. epileucus 



4. Tubes whitish, pilei grayish, subcespitose P. tephroleucus 



6. Flesh yellowish brown P. gilvus 



5. Flesh ferruginous, soft P. nidulans 



5. Flesh ferruginous, hard P. radiatus 



6. Flesh ferruginous, pileus golden P. aureonitens 



5. Flesh ferruginous, pileus cuticulate P. cuticulans 



6. Pores large P. aurantiacus 



6. Pores smaller P. Pilotae 



2. Scarcely cespitose, white P. salignus 



2. Scarcely cespitose, 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 



