A rare lichen species, previously known as Lecidea polycarpella Erichs., is reported for the territory of the Czech Republic for the first time. Until now, it has been collected in disturbed or urban habitats in Austria, Germany and Great Britain only. However, it is probably an overlooked species with a wider pattern of distribution. Due to a revised interpretation of the hvphae forming an “excipulum”, now regarded only as remnants of the hyphal layer surrounding the apothecium in its initial (primordial) stages, and due to some other microscopical features (type of paraphyses and asci), it is transferred to the genus Micarea. New combination is as follows: Micarea polycarpella (Erichs.) Coppins & Palice. This species was discovered in a secondary habitat — graphitic slate (occasionally enriched by iron) or phvilite boulders (with quartz eyes) in sedimentation basin of the factory for processing of pyrite material and the power station near Chvaletice in central Bohemia. More detailed description of this lichen and its habitat (inclusive associated species) is given.
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