Lichens

Plants that are composed of a fungus and an alga growing together symbiotically and often found growing on rocks or tree trunks.
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Bedrock, soil, and lichen geochemistry from Isle Royale National Park, Michigan

This is a report of geochemical data from various media collected on Isle Royale, a large island in northeastern Lake Superior. Isle Royale became a national park in 1940 and was designated as a wilderness area in 1976. USGS sampling began in 1996 as par

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