Order: Arthoniales       Family: Roccellaceae Species: Opegrapha rupestris Scribble lichen Growth type crustose. Parasitic. Photos: Parasitic on Verrucaria. Black Head, the Burren, Ireland. BLS Burren meeting 2009 Thallus barely visible. Scattered clusters of small lirellae, +/- rounded with persistently narrow central slit. Spores 3-septate. Occurs as a parasite on crustose Verrucariaceae on natural limestone and memorials, especially Verrucaria baldensis. Recorded from northern and western Ireland.

Opegrapha rupestris. BLS Burren meeting, April 2009