Description: This species grows on dry acid bark such as that of oak and yew. The thin thallus is grey, but sometimes a hint of green may be glimpsed. Discs (lirellae) are mostly simple and expanded, the spores three- to five-septate with an enlarged upper cell. The greenish colour of the epithecium in a squash of the disc is significant. It is easily overlooked for O. varia which has a brown epithecium. In Ireland, the species is thinly scattered.

Key Identification Features:

• • Grey thallus with greenish tinge: dry, acid bark of old trees
• The lirellae are expanded discs like those of O. varia but have three- to five-septate spores and a greenish epithecium.

Original text submitted by Vince J. Giavarini

Distribution Map from NBN: Alyxoria xerica at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Alyxoria xerica at iNaturalist World Species Observations database.