oak fern

English
an oak fern (Gymnocarpium dryopteris)

Alternative forms
  • oakfern

Noun

oak fern (plural oak ferns)

  1. Any of various ferns which grow on trees and walls
    1. genus Gymnocarpium (syn Thelypteris)
    2. especially common polypody (Polypodium virginianum, native to North America, and Polypodium vulgare, native to Europe), formerly thought to have medicinal properties when found growing on an oak.

Further reading
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