Description: Thallus Tephromela-like of grey or grey-yellowy warted areoles with strange black appressed discs like miniature, well-sucked Pontefract cakes (black liquorice sweets) pushed flat to the surface. Spores simple; Thallus K+ yellow; medulla Pd+ orange. The lichen is an upland species of exposed siliceous rocks; extremely northern and western in Ireland.

Key Identification Features:

• Thallus grey or grey-yellow of Tephromela atra/Lecanora gangaleoides-type but with smooth black, flat, liquorice¬-coloured discs
• Spot tests: medulla Pd+ orange; upland siliceous rocks – schists, gneiss.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Calvitimela aglaea at iNaturalist World Species Observations database.