Order: Acarosporales Family: Acarosporaceae
Species: Acarospora smaragdula
Photos: on upland rocks. Ballingeary area, Co. Cork, SW Ireland.
Variable. Thallus usually pale creamy brown but yellowish-green on copper-rich rocks. Scattered flat to convex areoles that can form continuous crust. There are usually 3-7 minute apothecia in each areole, red-brown to blackish, margins absent or well developed. Asci >100-spored, spores 2-5 x 1-2 Ám. Micro photo below.
K+ red, C-, KC+ red, P+ yellow. Rarely K- or KC-
Occurs on sheltered slightly base-rich siliceous rocks, sites rich in heavy metals and on sheltered stones below metal run-off.
Similar: A. fuscata. Brownish areoles, K-, C+ red, KC+ red