Irish lichens

Rhizocarpon richardii
Order: Lecanorales       Family: Rhizocarpaceae

Species: Rhizocarpon richardii

Growth type crustose.
Photos: On acidic coastal rock. Dunmanus Bay, Cork, SW Ireland.
Identified by Mike Simms

Brown to greyish-brown, areolate-cracked thallus, often with purplish tinge. Fimbriate blackish-brown prothallus is often present. Innate, flattish black apothecia with thin margins. The epithecium is dark-green or grey and K-.

Usually coastal, occuring on siliceous pebbles and rocks.
Medulla: K+/- yellow, usually C+ red, P+/- orange.
(R. hochstetteri and R. reductum are C-)

Rhizocarpon richardii

Rhizocarpon richardii
Rhizocarpon richardii on acidic coastal rock. March 2009

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