silver fern

from WordNet (r) 3.0 (2006)
silver fern
    n 1: tropical American fern having fronds with white undersides
         [syn: {silver fern}, {Pityrogramma calomelanos}]
    2: fern of southern tropical Africa having fronds with white
       undersides [syn: {silver fern}, {Pityrogramma argentea}]
    

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