Thelypteris dryopteris

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Noun1.Thelypteris dryopteris - 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
genus Gymnocarpium, Gymnocarpium - oak ferns: in some classification systems included in genus Thelypteris