Species: Bacidia inundata
Photos: On rocks in shaded streams. Ballingeary, Cork, SW Ireland
Smooth or areolate greenish-grey or green-fawn, granular thallus surrounded by a prominent white prothallus. Small, flat, brown apothecia becoming convex and +/- contorted. Pycnidia are +/- immersed, either white or dark brown. The asci are 8-spored, spores 3-8 septate, 25-45 x 2-3 Ám. Microscope photograph below.
Chemical reactions negative.
Occurs throughout Ireland on shaded acidic rocks in or beside clear, un-polluted streams, rivers and lakes.