oak fern

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Alternative forms[edit]


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[edit]