oak fern

oak fern

noun
a small woodland fern, Gymnocarpium dryopteris, of northern regions, having triangular, pinnate fronds that slant horizontally.

Origin:
1540–50; translation of Latin dryopteris < Greek dryopterís, equivalent to dryo- (combining form of drŷs oak) + ptéris fern

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World English Dictionary
oak fern
 
n
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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