22 American Boletes 



unpleasant to the taste, said to be poisonous; tubes adnate or 

 subdecurrent, slightly depressed, bright-lemon-yellow tinged with 

 green, becoming brownish-yellow with age, changing to blue when 

 wounded, mouths subangular, of medium size; spores oblong- 

 ellipsoid, smooth, yellowish-brown, 10-13 X 4-6/1; stipe equal 

 or enlarged above or below, pale-yellow with pink markings, 

 especially near the base, glabrous, faintly reticulate at the apex, 

 solid, yellow within, 6-10 cm. long, 0.5-1.5 cm. thick. 



Frequent in open woods and groves from Maine to North 

 Carolina. Somewhat poisonous, but readily recognized among 

 the red boleti by its quick change to blue at any point without 

 or within when bruised or even touched with the fingers. It is 

 often known as the sensitive boletus. 



37. Ceriomyces bicolor (Peck) Murrill 



Pileus somewhat irregular, firm, convex, 5-10 cm. broad; 

 surface dry, glabrous or finely tomentose or squamulose, at 

 times rimose-areolate with age, apple-red or purplish-red, often 

 fading or becoming stained with yellow when old; margin 

 irregular, sometimes upturned; context flavous, changing slowly 

 to blue at times when wounded, then back to flavous, taste 

 mild; tubes short, adnate, nearly plane, flavous when young, 

 becoming ochraceous with age, changing slowly to blue or 

 greenish-blue when wounded, mouths angular, of medium size, 

 2-3 to a mm.; spores fusiform, smooth, pale-ochraceous-brown, 

 10-12 X 4-5 m; stipe nearly equal, firm, solid, dark, usually 

 yellow and sometimes slightly reticulate at the apex, changing to 

 greenish-blue when bruised, smooth, nearly glabrous, showing 

 dark dots under a lens, soUd, flavous within, changing slowly to 

 blue, 4-10 cm. long, 0.7-1.5 cm. thick. 



Frequent in open woods from New England to North Carolina 

 and west to Wisconsin and Kentucky. Edible. 



38. Ceriomyces oregonensis Murrill 



Pileus convex, firm, solitary, 12 cm. broad; surface bay, even, 

 not viscid, short-tomentose to subglabrous, margin entire or 

 slightly lobed, scarcely projecting: context firm, white, unchang- 

 ing, taste mild, odor not characteristic; tubes very large, 2-3 

 mm. in diameter, depressed and radially elongate about the stipe, 

 ventricose, flavous to dull-greenish-yellow, melleous within, not 

 changing when bruised; spores oblong-ellipsoid, smooth, mel- 

 leous, 10-12 X 4 fi; stipe larger below, solid, white within, 

 glabrous, not reticulate, very pale bay, 6.5 cm. long, 2 cm. thick 

 at the center. 



