Boletus curtisii  Boletus curtisii is a species of fungus in the family Boletaceae. It produces small- to medium-sized fruit bodies (mushrooms) with a convex cap up to wide atop a slender stem that can reach a length of . In young specimens, the cap and stem are bright golden yellow, although the color dulls to brownish when old. Both the stem and cap are slimy or sticky when young. On the underside of the cap are small circular to angular pores. The mushroom is edible, but not appealing. It is found in eastern and southern North America, where it grows in a mycorrhizal association with hardwood and conifer trees. Once classified as a species of "Pulveroboletus", the yellow color of "B. curtisii" is a result of pigments chemically distinct from those responsible for the yellow coloring of "Pulveroboletus". The species was first described scientifically by English mycologist Miles Joseph Berkeley in 1853. The specific epithet "curtisii" honors Moses Ashley Curtis, who collected the type material from South Carolina. American mycologist William Murrill called it "Ceriomyces curtisii" in 1909, but "Ceriomyces" (as defined by Murrill in 1909) has since been subsumed into "Boletus". In his 1947 monograph on boletes of Florida, Rolf Singer transferred the species to the genus "Pulveroboletus", and made it the type of his newly described section "Cartilaginei", which featured species with a glutinous or sticky stem, and a leather-colored to brownish hymenophore. Species in "Pulveroboletus" are characterized by the presence of pigments based on the chemical structure of pulvinic acid, a yellow-orange compound found in some species of Boletales. The pigments responsible for the color of "B. curtisii" are, however, entirely different from the pulvinic acid compounds found in "Pulveroboletus" species, which invalidates the chemotaxonomical rational for generic placement in "Pulveroboletus". Otto Kuntze once placed the species in "Suillus", but it lacks the partial veil and glandular dots associated with that genus. William Chambers Coker and Alma Beers considered Charles Horton Peck's "Boletus inflexus" (described from New York in 1895) as well as Henry Curtis Beardslee's 1915 "B. carolinensis" to be the same species as "B. curtisii".