bladder-fern

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

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World English Dictionary
bladder fern
 
n
a small fern, Cystoperis fragilis, with graceful lanceolate leaves, typically growing on limestone rocks and walls
 
[C19: named from the bladder-shaped indusium]

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