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Annulohypoxylon sp.
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.
I believe this is a Annulohypoxylon fungus, however that's just second-guessing on my part. Xylaria polymorpha is also a candidate imo, but microscopic examination would be needed to be certain. Spotted in Sprielderbos, Veluwe, Holland. (sources:see reference)
Spotted on Oct 14, 2021
Submitted on Nov 2, 2021
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