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Crescent map lichen
Observed: 8th November 2009 By: lpearce
Added: 12th November 2009
Found this on a wall of a old clearance house.Thought it might be Rhizocarpon geographicum but the colour and appearance does seem to match the image on http://www.britishlichens.co.uk/species/Rhizocarpon%20lecanorinum%20smal...