Crustose black thallus up to 1mm thick, often mistaken for oil spill washed ashore. Close up thallus is cracked into neat areoles like dried mud. Usually with many conical fruiting bodies like warts (apothecia) about 0.5 mm diam. with distinct holes in top. Very common on all rocky coasts forming a black band at the top of the shore, above the barnacle line.
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