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Order: Lecanorales Family: Ramalinaceae
Species: Bacidina caligans (Bacidia caligans) Photos: On mortared wall, Coachford, Co. Cork, SW Ireland. Identified by John Douglass Pale green, grey or brownish finely sorediate thallus with discrete soralia and small red-brown or blackish apothecia. Margins often darker or excluded. Spores are 3-7 septate, 24-48(-63) x 1.5-2(2.5)µm. Pycnidia immersed, conidia curved 29-35 x 1µm. Microscope photograph below. Thallus reactions negative but hymenium K+ purple Usually on sheltered calcareous rocks, mortar and cement, less frequent on bark and rabbit droppings |