| Boletus aemilii Barbier |
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New classification: Basidiomycota/Agaricomycotina/Agaricomycetes/Agaricomycetidae/Boletales/Boletaceae Former classification: Basidiomycota/Homobasidiomycetes/Agaricomycetideae/Boletales/Boletaceae/Boletoideae [ section:Appendiculati ] synonyms: Baorangia emilei, Boletus spretus, Boletus emilii
edibility : unknown edibility
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The cap is vinaceous red to copper brown, blackish in bruises, firm, fleshy, convex, slowly expanding. The cap surface is finely downy and dry, thin and peelable. The cap margin is thick, more or less lobed, slightly retracting with age, often with a thin pale-yellow line. The stem is sturdy, thick and swollen or even hemispherical at first, later cylindrical or conical, tapering towards base and rooting; It is sulphur yellow at the top, covered with red dots below, concolorous with cap. sometimes with shades of red. A primitive, and often unilateral reddish network can sometimes be spotted, but it is not very visible.. The flesh is whitish to pale yellow but reddish in wounds or at stem base, thick, heavy, turning blue-green (greenish-grey blue) when cut and exposed to air, then becoming pale yellow, and eventually dark red after a few hours; its taste is pleasant, nutty; the odour is weak to fruity or acidic; The tubes are decurrent, rather short (2-5 mm), removable, sulphur yellow then olive-yellow, becoming green-blue when cut and exposed to air. The pores are small and round at first, later becoming irregular, angular and large (up to 1 mm wide), yellow to olivaceous orange yellow, turning blue-green when pressed. The spore print is olive brown. It grows in warm broad-leaved woods (this mushroom likes warm places and privileges southern parts of Europe), with beech, oak, chestnut. The fruiting period takes place from July to November.
Chemical tests : slow blueish-black reaction to Melzer's agent, blue-grey to iron sulphate, alomost no reaction to ammonia, brownish-yellow to potash, ochraceous yellow to sulphuric acid; no reaction to gaiac. Distinctive features : carmine red to reddish brown cap, blackening when touched; short tubes; yellow pores, orange in places, turning blue when pressed; thick flesh, pale yellow, turning blue when exposed to air; stem lemon yellow stem at apex, dotted with carmine red points below, without or with faintly visible network; species privileging hot places, under deciduous trees Boletus aemilii is still unreported so far in the forest of Rambouillet, and is quite rare, more generally speaking .
page updated on 14/01/18 |