Biscogniauxia nummularia

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Biscogniauxia nummularia
Biscogniauxia nummularia 37757.jpg
Scientific classification
Kingdom: Fungi
Division: Ascomycota
Class: Sordariomycetes
Order: Xylariales
Family: Xylariaceae
Genus: Biscogniauxia
Species: B. nummularia
Binomial name
Biscogniauxia nummularia
(Bull.) Kuntze (1891)
  • Biscogniauxia bulliardii (Tul. & C.Tul.) Kuntze
  • Hypoxylon nummularium Bull. (1790)
  • Hypoxylon nummularium var. nummularium Bull.
  • Kommamyce bulliardii (Tul. & C.Tul.) Nieuwl.
  • Nummularia anthracina (J.C.Schmidt) Traverso
  • Nummularia bulliardii Tul. & C.Tul.
  • Nummularia nummularia (Bull.) J.Schröt.
  • Numulariola nummularia (Bull.) House
  • Sphaeria anthracina J.C.Schmidt
  • Sphaeria nummularia DC.

Biscogniauxia nummularia is a plant pathogen in the family Xylariaceae, known as the beech tarcrust.[1] The specific epithet is derived from the Latin "nummus" meaning a coin, referring to the often rounded and coin-like encrustations.


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.[1] Young specimens are covered by a light brown outer layer. The spores are black to dark brown.


Biscogniauxia nummularia is a common fungus specific for Fagus, and has been recorded throughout Europe and Russia, following the extensive distribution of its host tree. [2]

As a primary pathogen[edit]

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.[3] It typically causes strip-cancer and general wood decay.[4]




External links[edit]