Irish lichens

Opegrapha atra 		Order: Arthoniales       Family: Roccellaceae

Species: Opegrapha atra

Growth type crustose, graphid.
Photos: On Ash trunk. Ballingeary, Cork, SW Ireland.

Thin or +/- evanescent whitish or green-grey thallus. Short (1mm), prominent lirellae with central slit, often densely crowded at centre of thallus. Pycnidia rare. Forms extensive mosaics on young trees.

Common on trees with smooth shaded bark, rarely on fences.
Thallus K-, C-, KC-. Spores 3-septate, hymenium I+ blue.



Opegrapha atra

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