American Boletes 15 



unchanging or sometimes slowly becoming yellowish, taste mild; 

 tubes adnate to nearly free, about i cm. long, white or cremeous, 

 becoming subferruginous when wounded or at the rnaturity of 

 the spores, mouths somewhat uneven, 2-3 to a mm., subcircular 

 to angular, stuffed when young; spores oblong, smooth, bright- 

 ferruginous-ochraceous, 8-12 X 4-5/1; stipe cylindric, tapering 

 downward, usually slightly eccentric, rarely reticulate above, 

 glabrous, white above and below, flesh-colored and more or less 

 streaked in the middle, spongy and white within, about 7 cm. 

 long and 1.5 cm. thick. 



Frequent in thin woods from Vermont to North Carolina and 

 west to Indiana. 



19. Ceriomyces ferruginatus (Batsch) Murrill 



Pileus convex to plane or nearly so, umbonate when young, 

 circular in outline, 2-5 cm. broad, reaching 7 cm. at times; 

 surface' smooth, glabrous, sometimes rimose-areolate, slightly 

 viscid in damp weather, varying from ochraceous to fulvous; 

 margin regular, entire, sometimes quite thick because of the 

 lengthening of the marginal tubes ; context thickest at the center 

 and gradually thinner toward the margin, yellow or yellowish- 

 white for the most part, but light-pink or roseous next to the 

 layer of tubes, darker when exposed to the air, acrid and peppery, 

 remarkably free from insects; tubes adnate, at length depressed 

 around the stipe, latericeous, becoming slightly darker when 

 wounded, tinged with ferruginous at the maturity of the spores, 

 equal to or longer than the thickness of the context, mouths 

 large, angular, unequal; spores subfusiform, ferruginous, 9-1 1 

 X 4/i; stipe central, slender, nearly equal, 2-5 cm. long, 4-5 

 mm. thick, rarely reaching 7 cm. in length and 8 mm. in thickness, 

 pulverulent, slightly veined above, smooth below, usually some- 

 what paler than the pileus, citrinous or flavous at the base, solid, 

 fleshy, and yellow within. 



Frequent in woods and open places throughout the northern 

 United States and Canada to the Pacific coast. Acrid and 

 peppery and considered poisonous. 



20. Ceriomyces Curtisii (Berk.) Murrill 



Pileus hemispheric, 2-5 cm. broad, 1.5-2 cm. thick; surface 

 glabrous, viscid, golden-yellow, changing to dull-brownish when 

 old, cuticle very tough, margin involute in young specimens; 

 context thin, white, pale-yellow when bruised; tubes adnate to 

 nearly free, plane or subventricose in mass, slightly decurrent. 



