8 THE POLYPORACEAE OF WISCONSIN. 



2. Grayish-white, pilei broad P. anax 



2. "White, pilei central stemmed P. umbellatus 



2. Greenish tawny, scarcely connate 



2. Brown, hard, fragrant P. graveolens 



3. Laterally stiped 7 



3. Not black at base 8 



3. Black at base 9 



7. Small, with veil P. volvatus 



7. Larger, no veil P. betulinus 



7. Pores large P. Jiispidellus 



8. Stipe central, pores large P. arcularius 



8. Stipe central, pores small P. trumalis 



8. Pores large, pileus whitish P. lentus 



8. Pores small, pileus white to greenish P. flavovirens 



8. Substance brown, in two layers P. circinatus 



8. Brown, not in two layers P. tomentosus 



8. Brown, large, fleshy P. Schweinitzii 



8. Whitish, pileus irregular, fleshy P. ovinus 



9. Lateral stiped P. squamosus 



9. Stipe punctate P. picipes 



9. Stipe not punctate P. elegans 



9. Stipe rooting P. radicatus 



Polyporus adustus ("Willdenow) Fries. 



Pileus fleshy, soft, thin, villous, ashy-pallid, effused-reflexed behind; 

 margin straight, blackening ; pores small, short, round, obtuse, whitish- 

 pruinose presently ashy-fuscous, the marginal obsolete. Spores color- 

 less, 4 to 5 microns. 



Morgan (18, VIII, p. 106) says that the typical villous form is sel- 

 dom met with, but that a form velvety, isabelline in color, thin and 

 coriaceous when dry, like P. isabellinus Schw., is common. Among 

 other things, Macbride says: "Our specimens are not villous unless 

 when young, generally soft, velvety or pulverulent.*' 



I have seen no specimen that can be called villous. They are gla- 

 brous when old, and velvety or soft tomentose when young. 



The characteristic feature of the species is the dull smoky or blackish 

 LymeniunL The pores are very small, short, obtuse, whitish-pruinose, 

 blackening when bruised ; the whole hymenium, which is of a soft, semi- 

 gelatinous consistence when young, turns black with age. 



This species is very common in the southern part of the state on pop- 

 lar and oak, but is not so abundant in the north. Specimens have been 

 collected at Cudahy, County Line, Madison, Horicon, Bangor, Sparta, 

 Blue Mounds, Blanchardville (McKenna) ; Star Lake, (Timberlake 

 and Denniston) ; Crandon, and Shanagolden. The largest specimen 



