Species: Caloplaca crenulariaGrowth type crustose
Photos: On coastal rock. Bantry, Cork, SW Ireland.
Identification needs confirming
Grey cracked or areolate thallus that may not persist. Numerous rusty orange-red roughened apothecia, colour remaining unchanged when wet. Asci 8-spored, ascospores 12-14 x 6-8 Ám.
Apothecia: K+ crimson / purple.
Shaded or well-lit siliceous rocks, inland as well as coastal.
Similar: C. ferruginea. Only occurs on trees.
C. ceraceae has discs that become greenish when wet.
Caloplaca crenularia on coastal rocks. February 2009