Description: Except in the very exposed parts of Ireland, virtually all free-standing ash trees will support this tiny crustose lichen on their twigs. The grey-green thallus forms scattered and often, small, isolated colonies among other twig species with discs that are variable blue-grey or darker, or of a half-and-half grey-white colouration. It often occurs with Lecania cyrtella and Caloplaca cerinella. It is widespread on basic and nutrient-rich trees and shrubs but is at present severely under-recorded.

Key Identification Features:

• It is not readily identified with the naked eye but through a hand lens it is easy to spot among the other twig lichens
• The tiny, grubby, grey-blue or grey-white discs (to 0.7mm diam.) should be enough to confirm its presence.

Original text submitted by Simon Davey

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

iNaturalist: Lecania naegelii at iNaturalist World Species Observations database.