Rhizocarpons or map lichens are considered the oldest living organism on Earth, age-estimated at 8,600 years. Specimen from Finland

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Keywords: ascomycota, ascomycotes, black, cliff, earth, enigmatic, finland, fungi, fungus, gray, grey, group, incertae, july, lichen, lichenized, lichens, living, map, nomenclature, oldest, open, organism, problematica, rhizocarpon, rock, sedis, shore, surface, taxa, taxonomic, taxonomy