BOLETI OF THE UNITED STATES 129 
against which the slender stem and unstuffed tubes militate. 
It is also incongruous among the Calopodes but as there 
seems to be no better place for it, we place it here for the 
present. 
Boletus griseus Frost 
Gray BoLetus 
Rep. 29, p. 45 
Pileus broadly convex, firm, dry, subglabrous, gray or 
graytsh-black, flesh whitish or gray; tubes adnate or slightly 
depressed around the stem, nearly plane, their mouths small, 
subrotund, whzte or whztesh, stem equal or slightly tapering 
upward, distinctly reticulated, whztesh or yellowish, some- 
times reddish toward the base; spores ochraceous-brown, 
.0004 to .00055 in. long, .o0016 to .o002 broad. 
Pileus 2 to 4 in. broad; stem 2 to q in. long, 3 to 6 lines 
thick. 
‘Thin woods and open places. New York, Peck. 
According to the Friesian arrangement, this species should 
be excluded from this tribe on account of the whitish color 
of the tubes; and yet it is so closely related to Boletus orna- 
tapes, that it scarcely differs in any respect except in color, 
and it might easily be considered a mere variety of that 
species. Such instances of close relationship have led me 
to disregard the division of the genus into series based on 
the color of the tubes. In this species the reticulations 
toward the base of the stem are sometimes much coarser 
and more conspicuous in the fresh plant than those above 
are, but in the dried plant the upper and finer ones are more 
distinct than the basal ones. This shows that the lower veins 
are somewhat intumescent when moist, as in the Laceripedes. 
