shield fern

shield fern

noun
any of numerous ferns of the genera Dryopteris and Polystichum, having shield-shaped indusia.

Origin:
1805–15

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
shield fern
 
n
any temperate woodland fern of the genus Polystichum having shield-shaped flaps covering the spore-producing bodies: family Aspleniaceae

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Britannica
Encyclopedia

shield fern

any member of the fern genus Dryopteris, in the family Dryopteridaceae. The genus has about 250 species with worldwide distribution. Shield ferns are medium-sized woodland plants with bright green, leathery leaves that are several times divided. They have numerous round spore clusters (sori) attached along the veins on the underside of the leaves and protected by a tissue covering (indusium) that is reniform (kidney-shaped).

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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