A tiny, inconspicuous crust without obvious marks of lichenization. It rarely forms small black perithecia, but minute pycnidia (<0.1 mm in diameter), producing characteristic, slightly melanized, 3-septate conidia, are often present. The species grows on smooth bark, especially on hazel trees, in humid habitats, such as in light scree forests. In Europe, it is regularly reported from the United Kingdom, otherwhere only a few records are known (e.g. from Ukraine). Eopyrenula avellanae has been found only once in the Czech Republic, in the Křivoklát region (protected area Týřov), where it occurs on smooth bark of old hornbeam in a rain-protected place, together with the very rare Naetrocymbe fraxini.taxonomic classification:
All records: 2, confirmed 2. One click on a selected square displays particular record(s), including their source(s).