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Related to reindeer lichen: reindeer moss, Cup lichen
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|Noun||1.||reindeer lichen - an erect greyish branching lichen of Arctic and even some north temperate regions constituting the chief food for reindeer and caribou and sometimes being eaten by humans|
lichen - any thallophytic plant of the division Lichenes; occur as crusty patches or bushy growths on tree trunks or rocks or bare ground etc.