bladder fern

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

1820–30; so called from the bladderlike indusium Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bladder fern
a small fern, Cystoperis fragilis, with graceful lanceolate leaves, typically growing on limestone rocks and walls
[C19: named from the bladder-shaped indusium]

Collins English Dictionary - Complete & Unabridged 10th Edition
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