2 American Boletes 



less compact than in most members of the family and therefore 

 drying more readily; tubes free, small, cylindric, white, not 

 covered with a veil; spores ellipsoid, smooth, hyaline, at length 

 pale-yellow; stipe soft and spongy within, usually becoming 

 hollow. 



Context white, quickly changing to blue when wounded; pileus 



grayish-yellow, floccose. i. G. cyanescens. 



Context white, unchangeable. 



Pileus reddish-brown. -i- G- castaneus. 



Pileus pale-yellowish. 3- G. subalbellus. 



I. Gyroporus cyanescens (Bull.) Qu61. 



Pileus convex, gregarious at times, 6-12 cm. broad, 1.5 cm. or 

 more thick; surface pale- tan with grayish-white background or 

 slightly brownish, opaque, appressed-tomentose or tomentose- 

 squamulose ; margin entire, concolorous, adorned in young plants 

 with a distinct cortina, which is a part of the general hairy 

 covering; context white or grayish- white, sweet, i cm. or more 

 thick, quickly changing to indigo-blue when wounded; hymenium 

 nearly plane, depressed near the stipe; tubes free, short, about 

 4 mm. long, white to yellowish, quickly changing to indigo-blue 

 when wounded, mouths circular, small, edges thin, entire; spores 

 ellipsoid, smooth, hyaline to pale-yellowish, 9-11X5-6^; 

 stipe ventricose, hollow at maturity, concolorous, clothed with 

 cottony threads, white within, becoming indigo-blue when 

 wounded, 5-10 cm. long, 1.5-3.5 cm. thick. 



Frequent in woods and groves from Canada to North Carolina 

 and west to Minnesota. 



2. Gyroporus castaneus (Bull.) Qudl. 



Pileus convex to subexpanded, slightly depressed, gregarious, 

 3-7 cm. broad; surface smooth, dry, minutely but densely 

 tomentose, orange-brown, fulvous, or reddish-brown; margin 

 thin, usually paler; context white, firm, nutty in flavor, un- 

 changing when wounded; tubes depressed, sinuate, short, watery- 

 white becoming light-yellow to dark-cremeous, mouths angular, 

 small, stuffed when young, edges thin, entire; spores ellipsoid, 

 smooth, hyaline to pale-yellowish, 8-9 X 4-5-5-5m; stipe sub- 

 attenuate above and below, cylindric or somewhat flattened, 

 tomentose, bright-brown, lighter at the apex, brittle, loosely 

 stuffed, with a small cylindric cavity at the center, 4-5 cm. 

 long, 6-10 mm. thick. 



Very common in open woods throughout temperate North 

 America. Edible. 



