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Definition of Bladder fern
1. Noun. Any fern of the genus Cystopteris characterized by a hooded indusium or bladderlike membrane covering the sori.
Generic synonyms: Fern
Group relationships: Cystopteris, Genus Cystopteris
Specialized synonyms: Brittle Bladder Fern, Brittle Fern, Cystopteris Fragilis, Fragile Fern, Cystopteris Montana, Mountain Bladder Fern, Berry Fern, Bulblet Bladder Fern, Bulblet Fern, Cystopteris Bulbifera
Group relationships: Cystopteris, Genus Cystopteris
Specialized synonyms: Brittle Bladder Fern, Brittle Fern, Cystopteris Fragilis, Fragile Fern, Cystopteris Montana, Mountain Bladder Fern, Berry Fern, Bulblet Bladder Fern, Bulblet Fern, Cystopteris Bulbifera