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Added: 26th June 2013
Lichen with brown areolate thallus growing in extensive patches on the quartz sandstone coping-stones on the brick walls of a bridge (third picture). Black lecideine apothecia with pruinose discs and pruinose margins. Whitish-cream patches (possibly soredia) on edges of some areoles (especially first picture and right hand side of second picture). Seems unlikely but possibly Porpidia melinodes.