Order: Lecanorales       Family: Micareaceae Species: Micarea denigrata Growth type crustose. Photos: On old fence posts. Ballingeary, Co. Cork, SW Ireland. Variable. Thallus of greenish-grey areoles, sometimes just a scurfy grey-black crust. Abundant small grey-black to brownish apothecia with +/- indistinct margins. Often +/- sterile on worked timber but then with numerous white-tipped black pycnidia. Pioneer species on worked timber, also found on untreated fence posts, rotting wood. All parts usually K-, C +/- orange-red

Micarea denigrata on wooden fence posts. October 2009