reindeer moss
noun
                                
              
          
                                                      : a gray, erect, tufted, and much-branched lichen (Cladonia rangiferina) that forms extensive patches in arctic and north-temperate regions, constitutes a large part of the food of caribou, and is sometimes eaten by humans                                      
                
called also reindeer lichen
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  Merriam-Webster unabridged




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