Tsukiyotake (Lampteromyces japonicus)

Japanese: ツキヨタケ(月夜茸) - ツキヨタケ（英語表記）Lampteromyces japonicus

Basidiomycetes, order Acarinales, family Tricholomataceae. It grows on dead beech trees or maple trunks in summer and autumn. When a fresh specimen is viewed in the dark, the underside of the cap will glow. The cap is initially spherical, but as it grows it becomes semicircular or kidney-shaped, with many overlapping leaves. It is 6-23 cm in diameter, and the surface of the cap is initially orange-yellow or cinnamon-colored, then dark brown or dark purple. The gills are yellow and then white. The spore print is white. This mushroom is similar in shape to oyster mushrooms and mukitake mushrooms, and in color to shiitake mushrooms, so there are many cases of severe poisoning if eaten by mistake. Tsukiyotake is characterized by a protuberance between the gills on the underside of the cap and the stalk, and by the fact that black tissue can be seen in a spotted pattern in the center of the stalk when it is torn apart. It is endemic to Japan and is found throughout the country.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

担子菌類マツタケ目シメジタケ科。夏秋の頃，ブナの枯れ木の上またはカエデの幹に生じる。新鮮な標本を暗所で見ると，その傘の裏面が発光するのがわかる。傘は初め球形であるが，生長すると半円形または腎臓形になって何枚も重なり合って伸びる。径6～23cm，傘の表面は初め橙黄色または肉桂色，のちに暗褐色または暗紫色になる。ひだは黄色のちに白色。胞子紋は白。このキノコは形がヒラタケ，ムキタケに似ており，また色がシイタケなどにも似ているので誤って食べると猛烈な中毒を起す例が多い。傘の裏のひだと柄との間に隆起があること，裂いてみると柄の中心部に黒い組織が斑紋状にみられることがツキヨタケの特徴である。日本特産で全土に産する。

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