134 THE POLYPORACEAE OF WISCONSIN. 



Boletus Eussellii Frost (Plate XXII, fig. 76). 



Pileus thick, hemispherical or convex, dry, tomentose-squamulose or 

 fasciculately red-pilose, yellowish beneath the tomentum, often rimose- 

 areolate, flesh yellowish, unchangeable ; tubes subadnate, often depressed 

 around the stem, rather large, dingy-yellow or yellowish-green; stem 

 very long, equal or tapering upwards, roughened by the lacerated mar- 

 gins of the reticulated depressions, red or brownish-red; spores olive- 

 brown, 18 to 23 microns long, 7.5 to 10 microns broad. 



Pileus 3.5 to 10 cm. broad ; stem 8 to 17 cm. long, 6 to 12 mm. broad. 

 Distinguished from the other species of this tribe by the dry squamu- 

 lose pileus and the color of the stem. 



Common. Localities : Madison, Blue Mounds, Devil 's Lake and Crys- 

 tal Lake. 



The largest measures 6 cm. in diameter and has a stem 16 cm. long 

 and 1.5 cm. thick. It is somewhat curved at the base and tapers up- 

 wards. The pileus is of a light leather tan, rough areolate tomentose 

 with a shaggy margin. Color of the hymenium is greenish yellow, pores 

 adnate, fairly large, unchangeable. The long stem with its lacerated 

 ridges is a constant and easily recognized feature. 



I. Subpruinosi. Tubes adnate, yellow, stipe equal. Pileus glabrous or 

 pruinose. 



Boletus miniato-olivaceus Frost. 



Pileus at first convex firm, then nearly plane, soft and spongy, glab- 

 rous, vermilion, becoming olivaceous, flesh pale yellow, changing to blue 

 where wounded; tubes bright lemon-yellow, adnate or subdecurrent ; 

 stem glabrous, enlarged at the top, pale-yellow, brighter within, some- 

 times lurid at the base, spores 12.5 microns long, 6 microns broad. 



Pileus 5 to 15 cm. broad; stem 8 to 10 cm. long, 6 to & mm. thick. 

 Woods and their borders. 



Localities: Madison (Denniston) and Ladysmith. The largest speci- 

 men was 8 cm. in diameter ; the stipe 8 cm. long and 8 mm. thick. The 

 color of the pileus was brick-red to olivaceous-red, convex, a little tom- 

 entose at least when mature ; the pores adnate to subdecurrent, large, 

 irregular yellow. The stipe spreads out into the pileus and tapers down- 

 ward. It is smooth, yellowish-red, tough. The flesh is whitish to yel- 

 lowish. The pores change color only slightly. Most of the specimens 

 are glabrous, and the stem is slightly red-streaked. 



