BOLETUS. 123 



B. subtomentosa. Fr. 



Pileus, convex, plane, soft, dry, villose-tomentose, sub- 

 olivaceous, concolor beneath the cuticle, often rimose areolate, 

 flesh white. 



Tubes, adnate or somewhat depressed around the stem, 

 yellow, mouths large, angular. 



Stem, stout, somewhat ribbed, sulcate, smooth or scurfy 

 with dots. 



Spores, .0004 to .0005 inch long, .00016 to .0002 broad. 



This is the so-called red cracked Boletus, for when cracked 



the interstices are yellow. The flesh does not change to blue 



in our species. 



Scarce in our woods. Found specimens in Dorney's woods near 

 Allentown. 



B. chysenteron. Fr. Red Cracked Boletus. 



Pileus, convex or plane, soft, fioccose, squamulose, often 

 rimoso-areolate, brown or brick red, flesh yellow, changing to 

 blue when exposed, red beneath the cuticle. 



Tubes, adnate, greenish yellow, changing to blue when 

 bruised, mouths large, angular, unequal. 



Stem, subequal, fibrous striated, red or pale yellow. 



Spores, fusiform, pale browm, .0004 to .0005 inch long to 

 .00016 to .0002 inch broad. Pileus two to three inches broad. 



Prof. Peck says in his Fifty-first Report : The variability of 

 this species is quite perplexing. Two forms occur. In one 

 form the pileus is red but fades to grayish buff. It has a 

 persistently red, minutely scurfy stem. In the other the pileus 

 is dark brown or olivaceous and the stem is pale red or yellow 

 and red. In both the flesh may be either yellow or whitish, 

 and the cracks in the pileus may be either red or pallid. 



Common in open woods throughout the Valley. 



