THE POLYPORACEAE OF WISCONSIN. 127 



Boletus scaber Fries 



Pileus convex, glabrous, viscid when moist, at length rugulose or riv- 

 ulose ; tubes free, convex, white, then sordid, their mouths minute, ro- 

 tund ; stem solid, attenuated above, roughened with fibrous scales ; spores 

 oblong-fusiform, snuff-brown, 13.8 to 17.6 microns long, 4 to 5 microns 

 broad. 



"Pileus 2.5 to 12.5 cm. broad; stem 8 to 12.5 cm. long, 6 to 16.8 mm. 

 thick. Woods, swamps and open places." 



This seems to be the most common Boletus t it having been found at 

 every place in the state where fungi have been collected. It is also the 

 most variable in size. Pilei have been found measuring from 3 to 20 

 cm. in diameter ; the stipes varying from 7 to 17 cm. in length and from 

 1 to 2.5 cm. in thickness. They are usually smooth and dry, but in 

 rainy or moist weather they may be quite viscid. 



The varieties aurantiacus, fuscus and mutabilis are also represented. 

 In the first the pileus is "orange or orange red." In the second the 

 pileus is ' ' brown or dark-brown, ' ' and in the third, ' ' the flesh changes 

 slightly to brown or pinkish where wounded." 



Boletus albellus Peck. 



Pileus convex or gibbous, soft, glabrous, whitish, flesh white, un- 

 changeable ; tubes convex, free or nearly so, small, subrotund, whitish, 

 unchangeable ; stem glabrous or minutely f urf uraceous, substriate, bul- 

 bous or thickened at the base, whitish ; spores brownish-ochraceous, 13.8 

 to 16.3 microns long, 5 to 6.3 microns broad. 



"Pileus 2.5 to 5 cm. broad; stem 2.5 to 5 cm. long, 6 to 12 mm. thick. 

 Woods." 



This is closely related to B. scaber, of which it may possibly prove 

 to be a dwarf form ; but it is easily distinguished by its smpoth or only 

 slightly scurfy and sub-bulbous stem. It shows no sign of the colored 

 dot-like squamules which are a constant and characteristic feature of 

 that species (21, 2, 8, p. 149). 



Collected in the Stone Lake region near Crandon. Largest specimen 

 was 5 cm. in diameter ; the stipe 7 cm. long and 1 cm. thick. Another 

 specimen had a stipe that was nearly 14 cm. long; this specimen grew 

 among tall grass in the woods. The pileus was whitish to grayish tan, 

 slightly tomentose. The pores were free, small, roundish, white. The 

 stipe tapers upwards, is whitish, appressed-scabrous. The flesh is whit- 

 ish, unchangeable. The species looks like a small, pale form of Boletus 

 scaber. 



