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This bark lichen is akin to L. chlarotera (described elsewhere) in most of its outward characteristics, other than the fact that there are no granules in the epithecium of the disc. It can also be told by the black prothallus protruding at the edges. Discs are as in L. chlarotera though many are piebald. Probably much overlooked. In Ireland, there are a few scattered records.
Original text submitted by Vince J. Giavarini