亚洲网紅露点

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shield fern

noun

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


shield fern

noun

  1. any temperate woodland fern of the genus Polystichum having shield-shaped flaps covering the spore-producing bodies: family Aspleniaceae
鈥淐ollins English Dictionary 鈥 Complete & Unabridged鈥 2012 Digital Edition 漏 William Collins Sons & Co. Ltd. 1979, 1986 漏 HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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亚洲网紅露点 History and Origins

Origin of shield fern1

First recorded in 1805鈥15
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Example Sentences

Examples have not been reviewed.

Ferns offer fine textures, and two tough evergreen species that are stellar in containers are Dryopteris erythrosora, autumn fern, and Polystichum setiferum 鈥楧ivisilobum鈥, the divided soft shield fern.

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The male fern resembles the marginal shield fern in outline, but the fronds are thinner, are not evergreen, and the sori are near the midvein.

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Although the genus Pol媒stichum represents the true shield ferns, the wood ferns are also thus designated, as their indusia have nearly the shape of small, roundish shields.

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Under this designation Clute has grouped three of the shield ferns, which have a close family resemblance, and has thus distinguished them from the wood ferns, which also belong to the shield fern family.

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