NATURAL HISTORY SURVEY 103 



Tubes at first nearly plane, adnate, white and stuffed, then 

 convex, depressed around the stem, ochraceous-yellow or brown- 

 ish-yellow and sometimes separating from the stem by the ex- 

 pansion of the pileus. 



Stem equal or slightly tapering upward, reticulated either 

 wholly or in the upper part only, colored like the pileus or a little 

 paler, sometimes slightly furfuraceous. 



Spores subfusiform, brownish-ochraceous, 12.5 to 15 x 5 

 to 6 /x.; pileus 7.5 to 15 cm. broad; stem 5 to 10 cm. long, ^ to 

 1 cm. thick. 



Grassy banks in woods, Pine, Indiana. September. Suf- 

 ficiently distinguished from B. Scaber by the reticulated stem. 

 Pepoon. 



Boletus edulis Bull. 



Pileus convex or nearly plane, glabrous, moist, at first com- 

 pact, then soft, variable in color, grayish-red, brownish-red or 

 tawny-brown, often paler on the margin; flesh white or yellowish, 

 reddish beneath the cuticle. 



Tubes convex, nearly free, long, minute, round, white then 

 yellow and greenish. 



Stem short or long, straight or flexuous, subequal or bulbous, 

 stout, more or less reticulate, especially Above, whitish, pallid or 

 brownish. 



Spores 12 to 15 x 4 to 5 /A.; pileus 10 to 15, cm. .broad; stem 

 5 to 15 cm. long, 1 to 3 cm. thick. 



Dry, open woods, Glencoe. August. Pileus occasionally 25 

 cm. broad. 



Boletus chrysenteron Fr. 



Pileus convex or plane, soft, floccose-squamose, often rimose- 

 areolate, 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 yellow. 



Spores fusiform, pale brown, 11 to 12 x 4 to 5 /tx. ; pileus 2.5 to 

 7.5 cm. broad; stem 2.5 to 7.5 cm. long, 6 to 12 mm. thick. 



Grassy places upon a wooded hillside, Glen Ellyn. August. 

 The plants are quickly destroyed by insect larvae. 



Boletus miniato-olivaceus Frost. 



Pileus at first convex and firm, then nearly plane, soft and 

 spongy, glabrous, vermilion becoming olivaceous; flesh yellow 

 changing to blue where wounded. 



Tubes bright lemon-yellow, adnate or subcurrent. 



Stem glabrous, enlarged at the top, pale yellow, brighter 

 within, sometimes lurid at the base. 



Var. sensibilis Pk. Pileus at first pruinose, red, becoming 

 glabrous and ochraceous with age; tubes bright yellow tinged 



