Cladonia rangiferina

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Noun1.Cladonia rangiferina - 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 humansCladonia rangiferina - 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.
Cladonia, genus Cladonia - type genus of Cladoniaceae; lichens characterized by a crustose thallus and capitate fruiting bodies borne on simple or branched podetia