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bladder fern

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bladder fern

–noun
any of several ferns of the genus Cystopteris, having pinnate leaves and growing in rocky areas.

Origin:
1820–30; so called from the bladderlike indusium
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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bladder fern  
n.  Any of various ferns of the widespread genus Cystopteris, having pinnately compound fronds and often growing in rocky areas.

[After its bladderlike indusium.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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