any of several ferns of the genus Cystopteris, having pinnate leaves and growing in rocky areas.
Origin of bladder fern
First recorded in 1820–30; so called from the bladderlike indusium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a small fern, Cystoperis fragilis, with graceful lanceolate leaves, typically growing on limestone rocks and walls
Word Origin for bladder fern
C19: named from the bladder-shaped indusium
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012