American Boletes 31 



Stipe reticulate above the annulus. 2. B. amabilis. 

 Stipe not glandular-dotted. 



Spores globose or subglobose. 3. B. sphaerosporus. 



Spores oblong-ellipsoid. 4. B. Clintonianas. 



Surface floccose-scaly. 5. B. Lakei. 



I. Boletus luteus L. 



Pileus convex, solitary, 5-10 cm. broad; surface smooth, 

 glabrous, very viscid, yellowish-brown, grayish-brown, or 

 reddish-brown, sometimes streaked, becoming darker and duller 

 with age; margin thin, entire or undulate; context compact, 

 pale-yellowish, darker with age, unchanging when wounded, 

 edible; tubes 1.5-2.5 mm. long, plane or conyex in mass, adnate 

 or slightly decurrent, somewhat depressed, dark-melleous, un- 

 changing when wounded, darker with age, mouths i mm. in 

 diameter, nearly circular, edges adorned with reddish-brown dots; 

 spores oblong-fusiform, smooth, yellowish-brown, 6-9 X 2.5-4/1; 

 stipe slightly tapering downward, pale-yellow to reddish-brown, 

 glandular-dotted both above and below the annulus, solid, 

 yellowish and unchanging within, about 3-6 cm. long, 1-2 cm. 

 .thick; annulus large, membranous, white to slightly brownish^ 

 glandular-dotted, persistent. 



Common in sandy soil in coniferous or mixed woods through- 

 out the eastern United States. Edible. 



2. Boletus amabilis Peck 



Pileus circular, convex, 5-18 cm. in diameter; surface glabrous, 

 reddish-tawny, with small brown or blackish-brown spots in 

 dried specimens, probably viscid when fresh; margin even, 

 sterile, concolorous; context pallid; tubes decurrent to the 

 annulus, short, yellow, mouths angular, radially elongate, edges 

 thin, entire; stipe equal or slightly tapering downward, paler 

 than the pileus, reticulate above the small whitish annulus, solid, 

 2.5-5 cm. long, 8-16 mm. thick. 



Collected a few times in dense spruce woods in Colorado. 



3. Boletus sphaerosporus Peck 



Pileus circular, convex, 7-15 cm. broad; surface smooth, 

 glabrous, viscid, cream-colored when young, becoming reddish- 

 brown with age; margin thin, even, regular, sterile, often inflexed 

 when dry, ornamented with portions of the veil; context pale- 

 yellowish, becoming brownish with age; tubes adnate or some- 

 what decurrent, pale-yellow or yellowish-buff, becoming olive- 

 brown or brown with age, tinged with green at times, mouths 



