Parmelia sulcata, commonly known as hammered shield lichen, cracked-shield lichen or powdered crottle, lichens from Finland

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Keywords: cosmopolitan, cracked-shield, crottle, finland, foliose, furrowed, gray, grey, hammered, lichen, lichens, maple, march, parmelia, powdered, resupinate, shield, spring, sulcata, tree, trunk, waxpaper