n.bright blue-green fern widely distributed especially in damp acid woodlands of temperate northern hemisphere
同义词：Gymnocarpium dryopterisThelypteris dryopteris
英汉双解大词典
oak fern
1.
N（名词）
a graceful light green polypody fern, Thelypteris dryopteris, having a creeping rhizome, found in acid woodlands and on rocks in the northern hemisphere 球子蕨