Description: This rare crustose species forms shiny, angular areoles (bits of thallus separated by cracks), rounded or sometimes warted; it is pale grey with a yellowy cast and is limited by a zoned margin. When fertile, the disc margin is shaped like an angular egg-timer giving the black disc a rather jagged and constricted appearance. The K+ red, Pd+ yellow-orange thallus is restricted to granitic rocks and schists (in Britain it has colonised a toppled Stonehenge sarson). In Ireland, it has been collected from Counties Antrim and Kerry. Last record was 1994.

Key Identification Features:

• Crustose lichen of granitic rock with rounded, angular areoles, grey with a yellowy sheen, limited by a conspicuous margin
• Discs black, rather jagged-edged; material without discs will turn red with K and yellow-orange with Pd.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Aspicilia epiglypta at iNaturalist World Species Observations database.