Irish lichens
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Order: Teloschistales Family: Teloschistaceae
Species: Polycauliona phlogina (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 µm diam. Apothecia 0.3-0.8 mm diam, discs deep yellow, +/- white-pruinose, margins often lacking soredia when mature. Spores 10-13 µm. Previously recorded on Elm bark, rare, declining. Old records from Co. Laois, Co. Fermanagh and East Donegal. Similar: Caloplaca citrina s.l has larger soredia and is saxicolous, Caloplaca flavocitrina has distinct squamules, sorediate at tips |
Caloplaca phlogina May 2010