138 THE POLYPORACEAE OF WISCONSIN. 



men measured 10 cm. in diameter ; 2 cm. in thickness ; the stem 10 cm. 

 long, 1.2 cm. thick. They grow in recent excavations in the northern 

 part of the state or in rich soil in mixed woods. 



Boletus chrysenteron Fries (Plate XXI, fig. 73). 



Pileus convex or plane, soft, floccose-squamulose, often rimose areo- 

 late, brown or brick-red, flesh yellow, red beneath the cuticle, often 

 slightly changing to blue where wounded; tubes subadnate, greenish- 

 yellow, changing to blue where wounded; their mouths rather large, 

 angular, unequal ; stem subequal, rigid, fibrous-striate, red or pale yel- 

 low ; spores fusiform, pale brown, 11 to 12.5 microns long, 4 to 5 mic- 

 rons broad. 



Pileus 2.5 to 8 cm. broad; stipe 2.5 to 8 cm. long, 6 to 12 mm. thick, 

 Woods and mossy banks. 



Localities: Madison, Crandon, Ladysmith and Blue Mounds. The 

 largest measured about 8 cm. in diameter; the stipe about 7 cm. in 

 length and 8 mm. in thickness. The color is usually brown or grayish- 

 brown, the pilei are dry, somewhat tomentose; the flesh pale yellow, 

 red beneath the cuticle. The tubes are long, the mouths large, greenish- 

 yellow, changing to bluish where wounded. The stem is rigid tough, 

 reddish. 



This species is easily recognized by the red flesh in the cracks of the 

 pileus. Otherwise, it is very much like B. sub-tomentosus, though not 

 so large and stout. 



Boletus radicans Pers. (Plate XXII, fig. 75). 



Pileus convex, dry, subtomentose, olivaceous-cinereus, becoming pale- 

 yellowish, the margin thin, involute, flesh pale-yellow, instantly chang- 

 ing to dark blue, taste bitterish ; tubes adnate ; their mouths large, un- 

 equal, lemon-yellow; stem even, tapering downwards and radicating, 

 flocculose with a reddish bloom, pale-yellow, becoming naked and dark 

 with a touch. 



Pileus 5 to 7.5 cm. broad; stem 5 cm. long, 1.25 cm. thick. 



A few specimens were found at Dorward's Gorge and Devil's Lake, 

 August, '06. 



Boletus Roxanae Frost. 



Pileus broadly convex, at first subtomentose, then fasiculately red- 

 pilose, yellowish-brown, flesh yellowish- white ; tubes at first whitish, 



