Species: Caloplaca verruculiferaGrowth type: Placodioid (crustose with lobed margins)
Photos: On coastal rock. Mizen Head, Co. Cork, SW Ireland.
Identification needs confirming
Thallus usually yellow to greenish-yellow (rarely slightly orange-tinged) with elongated, radiating lobes. The centre of the thallus is covered with irregular flattened-globose isidia, apothecia are rare.
K+ crimson / purple.
Coastal, often on nutrient-enriched bird-perching sites.
Similar: Caloplaca thallincola
Caloplaca verruculifera on coastal rock. Mizen Head, Co. Cork. June 2009