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''Boletus auripes'', commonly known as the butter-foot bolete, is a species of bolete fungus in the family Boletaceae. First described from New York in 1898, the fungus is found in eastern Asia, Central America, and eastern North America from Canada to Florida. It is a mycorrhizal species and typically grows in association with oak and beech trees. The fruit bodies (mushrooms) formed by the fungus have convex to nearly flat caps that are up to wide. The stems are up to long by thick, and feature reticulations (net-like ridges) on the upper portion. Other than the brownish upper cap, the entire surface of the mushroom is yellow. ''B. auripes'' is edible. It can be distinguished from other similar yellow boletes by differences in color, degree of stem reticulation, and distribution. ==Taxonomy== The species was originally described by American mycologist Charles Horton Peck in 1898. Peck collected the type specimen in Port Jefferson, New York.〔 In 1945, Rolf Singer proposed the variety ''Boletus auripes'' var. ''aureissimus'' as a new combination of the name ''Ceriomyces aureissimus'' described by William Alphonso Murrill in 1938;〔 this taxon is now regarded as a distinct species under the name ''Boletus aureissimus''.〔 In 1936, Wally Snell reported finding a specimen of ''Boletus crassipes'', another species described by Peck from Mount Gretna, Pennsylvania. Snell suggested that although ''B. crassipes'' might be a valid species distinguished from ''B. auripes'' by a deeper brown cap color, yellow flesh that does not fade to white, and a stem with a more orange-yellow color and more extensive reticulation, he conceded that it was not clear that the morphological characteristics between the two did not overlap, and that further collections would be needed to clarify any differences between them.〔 A couple of years later, he was more convinced of his stance and considered the two conspecific. The taxonomic authorities Index Fungorum and MycoBank, however, do not recognize this putative synonymy.〔〔 In the genus ''Boletus'', ''B. auripes'' is classified in section ''Appendiculati''. Species in this section are characterized by having a dry cap with a surface texture ranging from smooth to somewhat tomentose, yellow flesh, a reticulate stem, and a mild taste. Other North American boletes in this section include ''Boletus speciosus'' and ''Boletus regius''.〔 The specific epithet ''auripes'' means "golden yellow foot". It is commonly known as the "butter-foot bolete".〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Boletus auripes」の詳細全文を読む スポンサード リンク
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