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This is a specialist lichen of smooth-barked trees (especially hazel) in sheltered western woodlands. It differs from other Irish Thelotrema lichens in the numerous, flattened, glazed discs which appear jagged and disintegrating around the edges. The creamy white thallus can spread to dominate the bark along with Bactrospora homalotropa and other western Graphidion species. The spores are septate (never muriform). On hazel, rowan, holly, willow etc. Western Ireland.
Original text submitted by Vince J. Giavarini