Craig Cerrig Gleisiad a Fan Frynych National Nature Reserve - Photo Tour
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![Concentric boulder lichen](/p1080/concentric-boulder-lichen.jpg) Concentric boulder lichen, porpidia crustulata
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Keywords: plants, lichens, Craig Cerrig Gleisiad a Fan Frynych National Nature Reserve, nature reserves, Brecon Beacons National Park, Powys