Boletus hortonii Smith & Thiers syn. Boletus subglabripes var. corrugis Pk. Cap 4-12cm across, convex-flattened; pale reddish tan; dry, extremely wrinkled-rugulose to pitted. Tubes yellow, sometimes weakly staining blue. Pores very small; yellow, sometimes bruising weakly blue. Stem 60-100 x 10-20mm, equal to clavate; pale yellow to tan or reddish; smooth. Flesh firm; almost white. Odor pleasant. Taste pleasant. Spores subfusiform, 12-15 x 3.5-4.5µ. Deposit olive-yellow. Habitat in mixed deciduous woods. Rather rare. Found in eastern North America, west to Michigan. Season July-September. Edible. Comment Distinguished from the superficially similar Leccinum rugosiceps by the smooth stem, more rugose cap, and flesh not turning red.