American Boletes 35 



10. BOLETINELLUS Murrill 



Hymenophore annual, terrestrial or sometimes attached to 

 buried roots; pileus circular, varying to dimidiate at times; 

 surface dry, minutely tomentose to floccose-tomentose; con- 

 text white or yellowish, fleshy; tubes decurrent, large, shallow, 

 elongate, not easily separating, radiating, yellow, not covered 

 with a veil; spores ellipsoid, smooth, some shade of brown; stipe 

 central, eccentric or lateral, solid, fleshy, or spongy. 



Stipe eccentric or lateral; pileus reddish-brown, glabrous or 



minutely tomentose. i. B. merulioides. 



Stipe central. 



Pileus dark-chestnut, subtomentose. ;:. B. castanellus. 



Pileus bright-red, floccose-tomentose. 3. B. paluster. 



I. BoLETiNELLus MERULIOIDES (Schw.) MurriU 



Pileus thin, irregular, usually lobed, more or less deeply 

 depressed at maturity, gregarious, 5-12 cm. broad; surface dry, 

 minutely tomentose, dull-reddish-brown, margin undulate or 

 deeply lobed; context 5-10 mm. thick, yellow, changing slowly, 

 to bluish-green when wounded, having a musty or unpleasant 

 odor; tubes decurrent, hymenium honey-yellow when young,- 

 becoming dull-yellow with age, often changing slightly to blue 

 when wounded, tubes formed by radiating lamellae 2-3 mm. 

 apart, branching and connected by numerous irregular veins of 

 less prominence; spores subovoid to ellipsoid, smooth, yellow 

 to brownish-ochraceous, 8-1 1 X 5-7 n; stipe lateral or eccentric, 

 tough, expanded into the pileus, reticulate at the apex by the 

 decurrent walls of the tubes, concolorous, clothed like the pileus, 

 hollow, 1-3 cm. long, 8-12 mm. thick. 



Common from Canada to Alabama and west to Wisconsin, 

 on shaded banks and in low places in woods. 



2. BoLETiNELLUS CASTANELLUS (Peck) Murrill 



Pileus convex or nearly plane, 2.5-4 cm. broad; surface dry, 

 subtomentose, soft, spongy, dark-chestnut; context white or 

 yellowish-white; tubes adnate or slightly decurrent, nearly 

 plane in mass, brown, mouths large, angular; spores ellipsoid, 

 7.5-10 X 5 m; stipe short, concolorous, glabrous, slightly reticu- 

 late at the apex, solid, whitish or grayish within, 2.5 cm. long, 

 4-8 mm. thick. 



Occasional in woods from New York to Virginia. 



