4 American Boletes 



2. Tylopilus indecisus (Peck) Murrill 



Pileus thick, convex, 6-12 cm. broad; surface dry, minutely 

 velvety to glabrous, ochraceous-brown to chestnut, having no 

 violet tint when young; margin entire or undulate; context firm, 

 fleshy, white, unchangeable except in old specimens, which 

 become slightly greenish-yellow near the tubes when wounded, 

 taste mild; tubes adnate, not conspicuously depressed, white or 

 grayish-white, becoming flesh-colored from the mature spores, 

 usually changing to brownish when wounded, 0.5-1.5 cm. long, 

 mouths small, subcircular; spores oblong, smooth, dirty-rose- 

 colored, 12-15 X 4 Ai; stipe subequal, subconcolorous, usually 

 reticulate above, minutely furfuraceous, especially below, firm, 

 solid, 6-10 cm. long, 1-2 cm. thick. 



Rather common in thin deciduous woods from New York to 

 North Carolina and west to Missouri. 



3. Tylopilus gracilis (Peck) P. Henn. 



Pileus convex, 3-6 cm. broad, rarely larger; surface dry, 

 slightly viscid in wet weather, subtomentose or squamulose, 

 sometimes rimose or reticulate, dull-tan to reddish-brown; con- 

 text white, unchanging, taste mild, becoming acid; tubes nearly 

 free, depressed, white, becoming deep-flesh-colored, not changing 

 when wounded, mouths small, circular; spores ellipsoid, smooth, 

 subferruginous, 12-15 X 5-6 /i; stipe tapering upward, paler 

 and minutely tomentose or hoary above, concolorous, substriate, 

 and furfuraceous below, solid, fleshy, and white within, 6-10 

 cm. long, 0.5-1.5 cm. thick. 



Frequent in woods from Nova Scotia to Georgia, occurring 

 on the ground or on wood very much decayed. 



4. Tylopilus alboater (Schw.) Murrill 



Pileus convex, solitary or gregarious, 6-10 cm. broad, 2 cm. 

 thick; surface pruinose to tomentose, very dark brown to black; 

 margin rather thick, involute when young; context white, chang- 

 ing to pinkish-gray when wounded, taste nutty; tubes adnate, 

 slightly depressed, pale-gray to flesh-colored, changing slowly to 

 black or reddish-black when wounded, i cm. long, mouths 

 small, irregularly circular; spores oblong-ellipsoid, smooth, 

 pointed at one end, dull-flesh-colored, 10-12 X 4-6 ju; stipe 

 short, subequal, even, concolorous or a little paler than the 

 pileus, pinkish-gray at the apex, velvety at the base, solid, 5-8 

 cm. long, 1.5-2.5 cm. thick. 



Occasional in open deciduous woods from New York to Georgia 

 and west to Missouri. 



