Species: Ionaspis lacustris
Photos: On acidic rocks. Ballingeary area, Cork, SW Ireland.
Smooth, slightly cracked cream to orange thallus. Apothecia are frequent, to 0.4mm in diameter. Discs +/- convex, translucent-pink when wet, deep orange when dry, concave becoming flat. Asci 8-spored, spores simple, 13-20 x 6-11 Ám. Microscope photo below.
Chemical reactions negative.
Occurs on inundated upland siliceous rocks, also on upland bridges and rocks in seepage tracks. Most frequent in western Ireland.