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Order: Arthoniales
Family: Roccellaceae
Species: Enterographa zonata (Opegrapha 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. |
Immediately above: Enterographa zonata (Opegrapha zonata) on granite erratic, the Burren, April 2009