cladonia : Idioms & Phrases
cladonia rangiferina
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noun 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
reindeer moss; arctic moss; reindeer lichen.
WordNet
genus cladonia
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noun type genus of Cladoniaceae; lichens characterized by a crustose thallus and capitate fruiting bodies borne on simple or branched podetia
Cladonia.