Noun silver fern has 2 senses
  1. silver fern, Pityrogramma calomelanos - tropical American fern having fronds with white undersides
    --1 is a kind of fern
    --1 is a member of Pityrogramma, genus Pityrogramma
  2. silver fern, Pityrogramma argentea - fern of southern tropical Africa having fronds with white undersides
    --2 is a kind of fern
    --2 is a member of Pityrogramma, genus Pityrogramma
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