Boletus lignicola Kallenbach Cap 5-20cm across, convex with inrolled margin; reddish brown to yellow-brown or rust; subtomentose, floccose at first, then smooth. Tubes decurrent on stem; bright yellow. Pores bright yellow, bruising blue-green. Stem 30-80 x 5-25mm, often eccentric, tapered below; rust-yellow to brown; dry, pulverulent. Flesh firm; pale lemon yellow. Odor faint, aromatic. Taste pleasant. Spores ellipsoid, 6.5-9 x 2.8-3.8µ. Deposit olive. Habitat always on stumps or trunks of conifers, exceptionally on sawdust; often associated with the polypore Phaeolus schweinitzii. Rare. Found widely distributed in eastern North America. Season July-September. Edible.