"The map lichen (Rhizocarpon geographicum), the lichen most used in lichenometry."
"Rhizocarpon geographicum on quartz" by User:Tigerente - Self-photographed. Licensed under CC BY-SA 3.0 via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:Rhizocarpon_geographicum_on_quartz.jpg#mediaviewer/File:Rhizocarpon_geographicum_on_quartz.jpg
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