Boletus frostii Russ. apud Frost Frost's Bolete Cap 5-15cm across, convex then flat; deep blood red with a white bloom at first, soon disappearing, margin of cap with a very narrow yellow zone; smooth, quite viscid at first, then tacky to dry. Tubes sunken around stem; yellow to yellow-green, bruising blue. Pores very fine; intense deep blood red to purple, with white bloom when young, fading to orange-red when old. Stem 40-120 x 15-25mm, equal to slightly clavate; colored as cap but with prominent raised network over entire surface, the ridges of the network yellow overlying the blood-red background. Flesh yellow, instantly turning blue when cut. Odor pleasant. Taste pleasant. Spores fusiform, smooth, 11-15 x 4-5µ. Deposit olive-brown. Habitat in oak woods. Often locally common. Found throughout eastern North America from the Great Lakes region to Florida. Season July-September. Edible but not recommended.