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Gyroporus cyanescens
''Gyroporus cyanescens'', commonly known as the bluing bolete or the cornflower bolete, is a species of bolete fungus in the family Gyroporaceae. First described from France in 1788, the species is found in Asia, Australia, Europe, and eastern North America, where it grows on the ground in coniferous and mixed forests.
The yellowish to buff cap surface is fibrous and roughened, and reaches up to in diameter. The thick stem, roughly the same color as the cap or lighter, is hollowed out into chambers. All parts of the mushroom turn an intense blue color within a few moments of bruising or cutting. The mushroom is edible, despite its hard stem. A less common variety occurs where the color change is to deep violet rather than blue. The bluing reaction results from the oxidation of a chemical called gyrocyanin.
==Taxonomy==
The species was first described scientifically by French botanist Jean Baptiste François Pierre Bulliard in his 1788 ''Herbier de la France''.〔 Later synonyms include ''Boletus constrictus'' by Christian Hendrik Persoon in 1801,〔 ''Leccinum constrictum'' by Samuel Frederick Gray in 1821,〔 ''Suillus cyanescens'' by Petter Karsten in 1882,〔 and ''Leucoconius cyanescens'' by Günther Beck von Mannagetta und Lerchenau in 1923.〔 The variety ''violaceotinctus'' was described by Roy Watling in 1969 from collections made in Michigan, USA.〔
The specific epithethe aquarist's "green water" is commonly described as a dense bloom of free-floating single-cell algae is derived from the Ancient Greek κύανoς, meaning "dark blue",〔 while the varietal epithet ''violaceotinctus'' means "having a violet tinge".〔 It is commonly known as the bluing bolete〔 or the cornflower bolete.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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