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Annulohypoxylon have dark, hard, round fruitbodies and are extremely common on the bark of dead oaks and tanoaks. The fungus lives as an endophyte for much of its lifecycle, fruiting only after the tree has died.
On dead wood of deciduous trees.
Spotted on a fallen dead tree (unknown species) near Hoenderloo, Veluwe, Holland. (sources: see reference)
Spotted on Nov 1, 2020
Submitted on Nov 5, 2020