32 THE POLYPORACEAE OF WISCONSIN. 



When moist or growing the pileus is leathery tough and flexible 

 and it dries very hard and becomes brittle. 



The species may be recognized by the smooth, leathery pale-tan 

 pileus with the large angular or alveolar pores. 



Syn.: Hexagona alveolaris (D. C.) Murrill, 19, vol. 31, p. 327. 



Favolus rhipidium Berkeley (Plate I, fig. 7). 



Pileus coriaceous, reniform, concentrically sulcate, alutaceous or 

 white, cuticle seceding in small furfuraceous areoles; stipe lateral, 

 short, tapering downward, primrose, becoming yellow when dry ; pores 

 small, white, angular, denticulate. 



This species resembles Panus stipticus so much that doubtless it is 

 often passed by collectors of polypores. Like that species, it grows in 

 small densely cespitose tufts, the pilei being of about the same size 

 and color as those of P. stipticus. Even the stipe is of about the same 

 shape and size. 



The pilei are nearly always reniform, smooth and leathery in sub- 

 stance, alutaceous when growing, pale tan when dry. The stipe is 

 short, curved, lateral and tapers downward, of the same color as the 

 pileus. The pores are small and have the alveolar shape characteris- 

 tic of the genus. 



Specimens when fresh or moist measure from 1.5 cm. to 2.5 cm. 

 broad, and from 1 cm. to 2 cm. long, 3 mm. thick ; the stipe from 1 to 

 1.5 cm. long and 2 to 3 mm. thick. When dry, the pores are scarcely 

 visible. A few specimens were found on much decayed oak wood by 

 Mr. B. O. Dodge in Juneau County, and a few specimens were found 

 near Blue Mounds. 



Favolus Curtisii Berkeley. 



Pileus orbicular, umbilicate, thin; margin ciliate; stipe central, 

 thickening downward setulose; pores oblong, medium. 



Carolina, Curtis. "Pileus 18mm. broad, pellucid; stipe 2.5cm. 

 high, 3 mm. thick at the base; 1.5 mm. at the top: Pores roundish 0.5 

 Tnm. broad. Similar to Polyporus arcularius, but more delicate ". 

 Sac., vol VI, p. 391. 



Several specimens of this apparently rare species were found in 

 August 1902, near Oakfield, Fond du Lac County, growing from twigs 

 under the leaves on the western slope of a limestone ridge. They 

 agree very well with Berkeley's description and thus are easily iden- 

 tified. 



