Definition of 'silvery spleenwort'

Noun

1. fern with elongate silvery outgrowths enclosing the developing spores
      Synonyms: Deparia acrostichoides Athyrium thelypteroides
2. North American fern with narrow fronds on yellowish leafstalks
      Synonyms: glade fern narrow-leaved spleenwort Athyrium pycnocarpon Diplazium pycnocarpon

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