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''Cystolepiota bucknallii'' is a species of basidiomycete fungus of the genus ''Cystolepiota''. Found throughout Europe, it is a rare fungus occurring in deciduous forests. The small fruit bodies bear a distinctive smell of coal gas and appear in autumn on damp ground. It is not an edible mushroom. ==Description== The fruit body of ''Cystolepiota bucknallii'' is a relatively small, thin-fleshed agaric. The cap is at first hemispherical and becomes convex with maturity. It bears a broad central umbo and reaches 5 cm in diameter. The cap cuticle is white with a lilac or violet tinge. The gills are crowded and not attached to the stipe. Their colour is cream to pale yellow. The stipe is comparatively long (up to 6 cm), slender and bare, tinged lilac or violet except for the uppermost section where it is pallid. Both cap and stipe are covered with a mealy powder which is easily rubbed off. All parts are fragile. The flesh is white, thin and does not bear a distinctive taste.〔(【引用サイトリンク】 publisher=Rogers Plants Ltd )〕 The spore mass is white. With the aid of a light microscope, the spores are seen ellipsoid, smooth and colourless. When Melzer's reagent is applied, the spore walls barely stain; hence, the spores are weakly dextrinoid. Their dimensions are 7.5–10 µm by 1–3.5 µm.〔〔 ''Cystolepiota bucknallii'' has a characteristically pungent odour, reminiscent of coal gas or sulphur. Indole is present in this as well as in other similar-scented fungi: ''Tricholoma inamoenum'', ''Tricholoma lascivum'', ''Tricholoma sulphureum'' and others. While its edibility is not known, there exists speculation about possible toxicity.〔〔 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「Cystolepiota bucknallii」の詳細全文を読む スポンサード リンク
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