Dryopteris(redirected from shield fern)
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Related to shield fern: cinnamon fern, Christmas fern, ostrich fern
a genus of the fern family Aspleniaceae; rhizomes contain a toxin thought to be a thiaminase and which causes somnolence, stumbling gait and blindness due to encephalopathy in sheep and cattle. Includes D. borreri, D. filix-mas. Called also male fern.