American Boletes 



Tubes whitish, becoming yel- 

 low; mouths small, circu- 

 lar. 

 Tubes yellow; mouths large 

 and angular, especially 

 near the stipe. 

 Tubes small, yellowish, be- 

 coming brick-red on drying 

 or when bruised; pileus 

 large, 9-13 cm. in dia- 

 meter and 3 cm. thick. 

 Tubes changing to blue when 

 wounded. 

 Tubes at first grayish-white, 

 discolored later by the 

 spores; stipe bluish- 

 green at the top. 

 Pileus conspicuously re- 



ticulate-rimose. 

 Pileus not reticulate-rim- 

 ose. 

 Tubes yellow and large; stipe 

 and pileus usually red, the 

 latter often cracked. 



43. C. Roxanae. 



44. C. subtomentosus. 



45- C. tomentipes. 



46. C. fumosipes. 



47. C. sordidus. 



48. C. communis. 



I. Ceriomyces Russellii (Frost) Murrill 

 Pileus convex, 3-7 cm. broad, 2-3 cm. thick; surface dry, 

 slightly viscid when moist, clothed with a thick tomentum 

 agglutinated in raised squamules, presenting a reticulate appear- 

 ance, often rimose-areolate, light-brown to isabelline with 

 brown patches; context thin, cremeous, unchanging, taste mild, 

 slightly salty; tubes plane, adnate or very slightly sinuate, 

 depressed, cremeous when young, dark-flavous with a tinge of 

 green at maturity, mouths large, angular, uniform, edges thin; 

 spores ellipsoid, distinctly longitudinally striate, olivaceous, 

 15-17 X 7-8 ix; stipe long and slender, tapering upward, very 

 coarsely reticulate and fluted, the margins broad and lacerate, 

 swelling in wet weather, somewhat glutinous even in dry weather, 

 bright-pinkish-flesh-colored throughout, the depressions usually 

 not darker, firm, solid or slightly stuffed, yellow within, 5-12 cm. 

 long, i-i .5 cm. thick at the base. 



Occasional in open deciduous woods from New England to 

 Mississippi and west to Wisconsin. 



2. Ceriomyces Betula (Schw.) Murrill 

 Pileus hemispheric, 3-9 cm. broad, 1-2 cm. thick; surface 

 smooth, viscid, shining, perfectly glabrous, latericeous to almost 



