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Caloplaca limonia – new Irish species

Caloplaca limonia

Photo: Caloplaca limonia is a newly described species from the Caloplaca citrina group and recently accepted by the BLS as a British species. Lichens.ie (Paul Whelan) has now recorded it in Ireland. Distinguished from Caloplaca citrina by its pale milky colour (due to the large blastidia) and the wide apothecial rim (also covered in blastidia) and bright orange discs – (Description summarised from Powell & Vondr├ík (2012) and BLS Bulletin 110: 64 (2012)). Occurring on limestone, it seems not too fussy about its habitat. It is probable that it will be recorded across Ireland. The position of Caloplaca citrina in Ireland now needs to be reevaluated.