Boletus illudens Pk. Cap 3-9cm across, convex to flattened; pale pinkish buff to cinnamon, brighter, more lemon yellow at margin; dry, velvety, then moist but not viscid. Tubes adnate-decurrent; honey yellow to olivaceous. Pores large, angular; lemon yellow, then brownish where bruised or old. Stem 30-90 x 6-12mm, tapered below; pale brownish above becoming yellowish to mustard yellow at base; usually with coarse ridges and wrinkles above, but not truly reticulate. Flesh pallid, mustard yellow in base and below stem cortex. Odor not distinctive. Taste not distinctive. Spores subfusiform, 10-14 x 4-5µ. Deposit olive-brown. Habitat in oak or mixed woods. Often common. Found in northeastern North America. Season July-September. Edible. Comment A drop of ammonia on the cap cuticle produces a deep green reaction; the similar Boletus subtomentosus and Boletus nancyae Smith & Thiers turn purple-brown with ammonia.