136 THE POLYPORACEAE OF WISCONSIN. 



ored like the pileus ; spores fusiform, brownish-olive, 12.5 microns long, 

 5 microns broad. 



Pileus 7.5 cm. broad. 



Common around the Dells ; a few specimens were also found at Dor- 

 ward 's Gorge and at Blue Mounds, September 1910. 



Boletus auriporus Peck (Plate XXI, fig. 71). 



Pileus convex or nearly plane, glabrous or merely pruinose-tomentose, 

 grayish-brown, yellowish-brown or reddish-brown, flesh white, un- 

 changeable ; tubes plane or slightly depressed around the stem, adnate 

 or subdecurrent, bright golden-yellow, retaining their color when dried ; 

 stem equal or slightly thickened at the base, viscid or glutinous when 

 moist, especially toward the base, colored like or a little paler than the 

 pileus ; spores 7.6 to 10 microns long, 4 to 5 microns broad. 



Pileus 2.5 to 8 cm. broad ; stem 2.5 to 8 cm. long, 4 to 8 mm. thick. Thin 

 woods and shaded banks. 



"This species is remarkable for the rich yellow color of the tubes, 

 which is retained unchanged in the dried specimens, and for the viscid 

 stem. This character, however, is not noticeable in dry weather and was 

 overlooked in the original specimens. Boletus glutinipes, Frost MS., is 

 not distinct" (Peck, 21, 2, 8, p. 110). 



Found only once near Ladysmith, August 29, 1905. The pileus mea- 

 sured 7 cm. in diameter ; the stipe 12 cm. long and 1 cm. thick. The 

 pileus was convex, red to red-olivaceous, glabrous. The tubes were ad- 

 nate, small roundish, brilliantly golden-yellow. The stipe equal, flexu- 

 ous, smoothish yellow, red-striped, dry. The flesh white. 



The most prominent feature of this species is the golden-yellow of the 

 pores. As the specimen was collected in dry weather, the stipe was not 

 viscid. 



Boletus pallidus Frost (Plate XXI, fig. 72). 



Pileus convex, becoming plane or centrally depressed, soft, glabrous, 

 pallid or brownish-white, sometimes tinged with red, flesh white ; tubes 

 plane or slightly depressed around the stem, nearly adnate, very pale 

 or whitish-yellow, becoming darker with age, changing to blue where 

 wounded, the mouths small; stem equal or slightly thickened toward 

 the base, rather long, glabrous, often flexuous, whitish within; spores 

 pale ochraceous-brown, 10 to 12.5 microns long, 5 to 6 microns broad. 



Pileus 5 to 10 cm. broad ; stem 8 to 12 cm. long, 8 to 16 mm. thick. 

 "Woods. 



