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(Plants) 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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|Noun||1.||bladder fern - any fern of the genus Cystopteris characterized by a hooded indusium or bladderlike membrane covering the sori|
fern - any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores
Cystopteris, genus Cystopteris - chiefly small perennial rock ferns: bladder ferns; in some classifications placed in Polypodiaceae
brittle bladder fern, brittle fern, Cystopteris fragilis, fragile fern - delicate fern widely distributed in North America and European having thin pinnatifid fronds with brittle stems
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