BOLETI OF THE UNITED STATES. 89 
Boletus flavus Wirz. 
LIGHT-YELLOwW BoLETUS 
Hym. Eur. p. 497. Syl. Fung. Vol. VI, p. 4. 
Pileus convex, compact, covered with a brownish separat- 
ing gluten, pale-yellow, flesh pale-yellow ; tubes large, angular, 
adnate, yellow; stem yellow becoming brownish, reticulated 
above the membranous fugacious dirty yellowish annulus ; 
spores .0003 to .0004 in. long, .coor2 to .00016 broad. 
Pileus 2 to 5 in. broad; stem 2 to 3 in. long, 6 to 10 lines 
thick. 
Woods. Minnesota, /ohuson. Wisconsin, Bundy. 
This is apparently a rare species in this country. I have 
not seen it. It is said to resemble &. /uteus, from which it 
is separated by the large angular mouths of the tubes. In 
British Fungi the spores are described as “spindle-shaped, 
yellowish-brown ;” in Sylloge, as ‘“ovoid-oblong, acute at 
the base, granulose, pale ochraceous.” 
Boletus sphzerosporus Px. 
GLOBOSE-SPORED BOLETUS 
Bulletin Torrey Botanical Club, Vol. XII, p. 33. 
Pileus at first hemispherical, then convex, glabrous, viscid, 
creamy-yellow, becoming reddish-brown or chestnut color 
with age, flesh pale yellowish-brown ; tubes adnate or slightly 
decurrent, large, angular, pale-yellow, becoming brown, 
sometimes tinged with green; stem stout, equal, even or 
slightly reticulated at the top, the membranous annulus per- 
sistent, sometimes partly adhering to the margin of the 
pileus; spores globose or broadly elliptical, .0003 to .00035 
in. long. 
Pileus 3 to 8 in. broad ; stem 1 to 3 in. long, 6 to 12 lines 
thick. 
