Order: Peltigerales Family: Collemataceae
Species: Collema flaccidum
Photos: On rock in upland stream. Ballingeary, Cork, SW Ireland.
Thin dark olive-green to black lobes, smooth, wavy, +/- rounded, margins usually entire. Centre and margins with numerous isidia, globose becoming flattened. Apothecia are very rare.
Occurs mainly in N and W Ireland on acidic rocks by streams, waterfalls and lough edges, also on damp, mossy woodland rocks. Chemical reactions negative.
Similar: Collema glebulentum and Collema subflaccidum
Collema flaccidum. Ballingeary area, Co.Cork. June 2009