Biscogniauxia bulliardii (Tul. & C. Tul.) Kuntze
Biscogniauxia nummularia is a plant pathogen in the Xylariaceae family, known as the Beech Tarcrust. The Latin 'nummus' meaning a coin, applied as the encrustations are often rounded and coin-like.
Views of the Beech Tarcrust
The fruiting 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. Young specimens are covered by a light brown outer layer. The spores are black to dark brown. B. nummularia is a common fungus specific for Fagus, and has been recorded from all parts of Europe and Russia, following the extensive distribution of its host tree. 
B. nummularia as a primary pathogen
The decline of European beech (Fagus sylvatica) in Sicily and Calabria (Italy) has been linked to B. nummularia and experiments have suggested that this Ascomycete plays a primary pathogenic role under certain environmental conditions. It typically causes strip-canker and general wood decay.
- Phillips, Roger (2006). Mushrooms. London : Pan MacMillan. ISBN 0-330-44237-6
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