36 American Boletes 



3. BoLETiNELLUS PALusTER (Peck) MurriU 



Pileus thin, broad, convex to plane or slightly depressed, at 

 times with a small umbo, 3-7 cm. broad, 1.5-2 cm. thick; surface 

 floccose-tomentose, bright-red; margin thin, subincurved; con- 

 text yellowish-white, unchangeable, comparatively thick; tubes 

 slightly decurrent, short, yellow, changing to bluish-green when 

 wounded, becoming sordid-ochraceous with age, mouths very 

 large, 1-2 mm. in radial diameter, compound, angular; spores 

 ellipsoid, dirty-greenish-yellow when fresh, becoming pinkish- 

 brown, 6-8 X 2.5-4 m; stipe slender, yellow and striate at the 

 apex, minutely squamulose, strongly tinged with red, yellow and 

 tomentose at the base, solid, 2.5-5 cm. long, 4-6 mm. thick. 



Occasional in wet and mossy places from Ontario to New 

 Jersey and west to Wisconsin. 



II. BOLETINUS Kalchb. 



Hymenophore annual, terrestrial or rarely epixylous, centrally 

 stipitate; surface dry, minutely silky to fibrillose or squamose; 

 context whitish or yellowish, fleshy or spongy; tubes large, 

 shallow, elongate, tough, not easily separating, radiately ar- 

 ranged, adnate or slightly decurrent, yellowish, covered with a 

 veil; spores elongate, smooth, yellowish-brown to purplish-brown, 

 sometimes with greenish tints; stipe more or less annulate, 

 spongy or hollow within. 



stipe hollow; pileus tawny-brown, fibriliose-squamulose. i. B. cavipes. 

 Stipe solid. 



Pileus whitish or grayish, slightly squamulose. 2. B. grisellus. 

 Pileus yellow or yellowish. 



Pileus 9 cm. or less broad. 3. B. Berkeleyi, 



Pileus 10 cm. or more broad. 4. B. appendiculatas. 

 Pileus red or reddish, conspicuously squamose. 



Spores purplish-brown; scales scattered. 5. B. spectabilis. 



Spores ochraceous-brown; scales dense. 6. B. pictus. 



I. BoLETiNus CAVIPES (Opat.) Kalchb. 



Pileus broadly convex, rather tough, flexible, usually subum- 

 bonate, 3.5-10 cm. broad; surface soft, fibriliose-squamulose, 

 tawny-brown, sometimes tinged with reddish or purplish; 

 context thin, yellowish; tubes slightly decurrent, pale-yellow 

 when young, darker and tinged with green at maturity, becoming 

 dingy-ochraceous with age; spores ellipsoid, olivaceous when 

 fresh, changing later to yellowish-ochraceous, 7.5-10 X 4m; 

 stipe equal or slightly tapering upward, slightly fibrillose or 



