Order: Teloschistales Family: Teloschistaceae
Species: Caloplaca phlogina
Photos: On Malus. Bandon, Co. Cork, SW Ireland.
Identified by Brian Coppins
Thin, smooth thallus, whitish-grey to pale yellow, sometimes with shallow, bullate aureoles. Prothallus absent. Pale greenish-yellow soralia can spread to cover whole thallus. Soredia 30-50 Ám diam. Apothecia 0.3-0.8 mm diam, discs deep yellow, +/- white-pruinose, margins often lacking soredia when mature. Spores 10-13 Ám.
Previously recorded on Elm bark, rare, declining.
Old records from Co. Laois, Co. Fermanagh and East Donegal.
Similar: Caloplaca citrina has larger soredia and is saxicolous,
Caloplaca flavocitrina has distinct squamules, sorediate at tips
Caloplaca phlogina May 2010