SOME COMMON MUSHROOMS AND HOW TO KNOW THEM 47 
BOLETUS CHRYSENTERON 
The cap is convex or plane, brown or brick red, more or less cracked, 
subtomentose; the flesh is yellow, red immediately beneath the cuticle, chang- 
ing to slight blue where wounded; the tubes are subadnate, yellow then 
greenish, large, angular; the stem is fibrous, striate, equal, red or yellowish. 
The cap is 1 to 3 inches broad; the stem is 1 to 3 inches long. 
Authors differ concerning the edibility of this species; consequently extreme 
caution should be used to avoid collecting it for Boletus bicolor, which is 
edible. 
BOLETUS EDULIS. EDIBLE BOLETUS. (EDIBLE) 
(Fig. 42) 
The cap is convex to expanded, smooth, firm when young, becoming soft 
in age, the color varying from grayish red to brownish red, generally paler 
on the margin; the flesh is white or yellowish, sometimes reddish beneath the 
cuticle; the tubes are 
convex, nearly free, long, 
minute, white, then yel- 
low, and greenish; the 
stem is variable in 
length, straight or flex- 
uous, equal or buibous, 
more or less reticulated, 
whitish, palid. or 
brownish. 
The cap is 4 to 6 
inches broad; the stem 
is 2 to 6 inches long. 
This is a species of 
frequent occurrence and 
the one of this genus 
most commonly eaten. 
BOLETUS BICOLOR 
(EDIBLE) 
The cap is convex, 
glabrous, pruinose, dark 
red, paler in age and 
sometimes spotted with 
yellow, firm; the flesh is 
yellow, sometimes chang- 
ing to blue where 
wounded; the tubes are 
nearly plane, adnate, 
bright yellow, changing 
to blue where wounded, 
mouths small angular or 
subrotund; the stem is FIGURE 42.—Boletus edulis. (Edible) 
subequal, solid, red. 
The cap is 2 to 4 inches broad; the stem is 1 to 3 inches long. 
This is a very attractive little species, occurring quite commonly in Virginia 
and Maryland in the woods and on lawns in shady places. It is considered 
one of the best edible species. 
STROBILOMYCES 
The genus Strobilomyces closely resembles Boletus, but it may be 
distinguished by the less easily separable tubes and extremely scaly 
cap and stem. 
