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''Caloboletus calopus'', commonly known as the bitter beech bolete or scarlet-stemmed bolete, is a fungus of the bolete family, found in Asia, Northern Europe and North America. Appearing in coniferous and deciduous woodland in summer and autumn, the stout fruit bodies are attractively coloured, with a beige to olive cap up to 15 cm (6 in) across, yellow pores, and a reddish stipe up to long and wide. The pale yellow flesh stains blue when broken or bruised. Christiaan Persoon first described ''Boletus calopus'' in 1801. Modern molecular phylogenetics showed that it was only distantly related to the type species of ''Boletus'' and required placement in a new genus; ''Caloboletus'' was erected in 2014, with ''C. calopus'' designated as the type species. Although ''Caloboletus calopus'' is not typically considered edible due to an intensely bitter taste that does not disappear with cooking, there are reports of it being consumed in eastern Europe. Its red stipe distinguishes it from edible species, such as ''Boletus edulis''. ==Taxonomy== ''Caloboletus calopus'' was originally published under the name ''Boletus olivaceus'' by Jacob Christian Schäffer in 1774,〔 but this name is unavailable for use as it was later sanctioned for another species.〔 Johann Friedrich Gmelin's 1792 synonym ''Boletus lapidum''〔 is also illegitimate.〔 Christiaan Hendrik Persoon described the mushroom in 1801;〔 its specific name is derived from the Greek ''καλος/kalos'' ("pretty") and ''πους/pous'' ("foot"), referring to its brightly coloured stipe. The German name, ''Schönfußröhrling'' or "pretty-foot bolete", is a literal translation. Alternate common names are scarlet-stemmed bolete〔 and bitter beech bolete.〔 Other synonyms include binomials resulting from generic transfers to ''Dictyopus'' by Lucien Quélet in 1886,〔 and ''Tubiporus'' by René Maire in 1937.〔 ''Boletus frustosus'', originally published as a distinct species by Wally Snell and Esther Dick in 1941,〔 was later described as a variety of ''B. calopus'' by Orson K. Miller and Roy Watling in 1968.〔 Estadès and Lannoy described the variety ''ruforubraporus'' and the form ''ereticulatus'' from Europe in 2001.〔 In his 1986 infrageneric classification of the genus ''Boletus'', Rolf Singer placed ''C. calopus'' as the type species of the section ''Calopodes'', which includes species characterised by having a whitish to yellowish flesh, bitter taste, and a blue staining reaction in the tube walls. Other species in section ''Calopodes'' include ''C. radicans'', ''C. inedulis'', ''B. peckii'', and ''B. pallidus''.〔 Genetic analysis published in 2013 showed that ''C. calopus'' and many (but not all) red-pored boletes were part of a ''dupainii'' clade (named for ''Boletus'' (now ''Rubroboletus'') ''dupainii''), well-removed from the core group of the type species ''B. edulis'' and relatives within the Boletineae. This indicated it needed placement in a new genus.〔 This took place in 2014, ''B. calopus'' was transferred to (and designated the type species of) the new genus ''Caloboletus'' by Italian mycologist Alfredo Vizzini.〔 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「Caloboletus calopus」の詳細全文を読む スポンサード リンク
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