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''Biscogniauxia nummularia'' is a plant pathogen in the family Xylariaceae, known as the beech tarcrust.〔 The specific epithet is derived from the Latin "nummus" meaning a coin, referring to the often rounded and coin-like encrustations. ==Description== The fruit body forms a thick and shiny black crust, on beech (''Fagus'') bark and is found at all times of the year. It is not edible.〔Phillips, Page 376〕 Young specimens are covered by a light brown outer layer. The spores are black to dark brown. File:Detail of Biscogniauxia nummularia.JPG|Detail of the tarcrust's structure File:Biscogniauxia nummularia.JPG|Beech tarcrust growth File:Beech Tarcrust fungus.JPG|Encrustations on beech bark 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「Biscogniauxia nummularia」の詳細全文を読む スポンサード リンク
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