Observation 178828: Graphis Adans.

on Quercus limb

thin whitish crust, K+ brown turning slowly blood-red UV-, lirellae short to longer and sparsely branched prominent epruinose with lateral to basal thalline margin entire, exciple brown, hymenium hyaline strongly finely inspersed clearing in K, exciple carbonized laterally, cortex virtually lacking, spores 8 per ascus hyaline ellipsoid lenticular lumina 5-6-septate smooth older spores swollen a bit around septa to ~20-25×7-8um

Maybe Graphis cincta?

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