Irish lichens

Caloplaca arnoldii

Order: Teloschistales       Family: Teloschistaceae

Species: Caloplaca arnoldii

Growth type crustose.
Photos: On rock. Killarney NP, Co. Kerry, SW Ireland.
Identified by John Douglass

Thallus is crustose in the centre with minute lobes at the margins, the tips adpressed. Initially yellow-orange, becoming deep reddish-orange. Apothecia with orange-red discs, 0.2-0.5mm, well developed orange margins. K+ red-purple.

Widespread but scarce on well-lit siliceous rocks, usually coastal.

Caloplaca arnoldii

Caloplaca arnoldii. November 2010

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