Crustiose Lichen Rhizocarpon petraeum

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Image showing the fruiting bodies arranged in concentric lines which aspecies characteristic was once suitably called Rhizocarpon
concentricum. Found extensively on a dry stone wall display

IMAGE 16448 (C) 2008 COLIN DUKE

IMAGE 16450 (C) 2008 COLIN DUKE

IMAGE 16451 (C) 2008 COLIN DUKE