Irish lichens

Opegrapha zonata, Enterographa zonata
Order: Arthoniales       Family: Roccellaceae

Species: Opegrapha zonata

Growth type crustose. Previously Enterographa zonata
Photos: On shaded rock. Gougane Barra, Cork, Ireland.
Identified by John Douglass

Mosaic-forming cracked or smooth chocolate-brown thallus, often violet-tinged. Dark prothallus. Mauve-tinged dark-brown soredia on surface erode leaving paler patches. Apothecia rare.
Chemical reactions negative.

Occurs on damp, shaded siliceous rocks.

Similar: Opegrapha gyrocarpa. Soralia C+ red.


Opegrapha zonata, Enterographa zonata


Opegrapha zonata, Enterographa zonata



Immediately above: Opegrapha zonata on granite erratic, the Burren, April 2009

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