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This is a species of intertidal rocks and stones, especially along sheltered shores and estuaries. Generally, the thin brown to blackish thallus lacks the cracked surface of similar species but has instead a fine stippling of small dark dots and ridges. The small (to 0.2mm diam.) spherical discs (perithecia) form shiny conical projections which sit almost on the surface like black beads. Throughout Ireland in suitable habitats.
Original text submitted by Vince J. Giavarini