102 THE CHICAGO ACADEMY OF SCIENCES 



5. Tubes becoming ochraceous or brownish . . B. separans. 

 5. Tubes becoming yellowish or greenish. . . .B. edulis. 



6. Pileus viscid or glutinous 7 



6. Pileus velvety or floccose-scaly B. chrysenteron. 



6. Pileus glabrous, vermilion then oli- 

 vaceous B. miniato-olivaceus 



7. Pileus dingy-yellowish, or ferruginous- 

 brown, annulate B. subluteus. 



7. Pileus fuscous-ferruginous then yellowish, 



exannulate B. granulatus. 



7. Pileus golden yellow B. hirtellus. 



8. Pileus pale red, stem pallid, yellow at 



base B. chroinaves. 



8. Pileus and stem cinnamon or reddish- 

 brown B. castaneus. 



Boletus felleus Bull. 



Pileus convex or nearly plane, firm, becoming soft, glabrous, 

 even, variable in color, pale-yellowish, grayish-brown, yellowish- 

 brown or chestnut; flesh white, often changing to flesh-color 

 where wounded; taste bitter. 



Tubes adnate, long, convex, depressed around the stem, their 

 mouths angular, white, becoming tinged with flesh-color. 



Sterrx variable, 'eq^a) br tapering upward, short or long, some- 

 times bulbous or enlarged, ,at the base, subglabrous, generally 

 retipfcl^ifet? i-ibove, colore<d like or a little paler than the pileus. 



Spores 'o'biong-fVsifoftn', 'flesh-colored, 12.5 to 17.5 x 4 to 5 /x. ; 

 pileus 12 to 15 cm. or more broad; stem 5 to 15 cm. long, 1 to 

 3 cm. thick. 



Woods and shaded banks, Glen Ellyn. August. 

 Boletus affinis Pk. 



Pileus convex or nearly plane, dry, glabrous or minutely 

 tomentose, even or slightly rugose, brown or chestnut-color, fad- 

 ing to tawny or ochraceous with age, sometimes rimose-areolate 

 or spotted; flesh white, occasonally slowly changing to yellowish 

 where wounded. 



Tubes plane or convex, adnate or slightly depressed around 

 the stem, at first white and stuffed, then glaucous-yellow or 

 subochraceous, becoming ferruginous-ochraceous where wounded. 



Stem subequal, sometimes narrowed either above or below, 

 even or rarely slightly reticulated at the top, glabrous, colored 

 like or paler than the pileus, sometimes tinged with red. 



Spores bright ferruginous-ochraceous, 9 to 12 x 4 to 5 /x. ; 

 pileus 5 to 10 cm. broad; stem 4 to 9 cm. long, 8 to 16 mm. thick. 



Sandy woods. Millers. August. 

 Boletus separans Pk. 



Pileus convex, thick, glabrous, subshining, often pitted, 

 lacunose or corrugated, brownish-red or dull-lilac, sometimes 

 fading to yellowish on the margin; flesh white, unchangeable. 



