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(Plants) a graceful light green polypody fern, Thelypteris dryopteris, having a creeping rhizome, found in acid woodlands and on rocks in the northern hemisphere
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|Noun||1.||oak fern - bright blue-green fern widely distributed especially in damp acid woodlands of temperate northern hemisphere|
fern - any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores