Cistopteris Fragilis, Bernhardt 
BRITTLE BLADDER FERN. 
Root — Black and wiry, caudex small and somewhat flat. 
Frond — Lanceolate, bipinnate, from four to sixteen inches 
long. 
Stipes — One-third the length of the frond, varying with 
the situation of the plant. 
Pinnas — Lanceolate, alternate, pinnate ; the lower pair 
deflexed, and shorter than the upper pinnae. 
Pinnules — Oblong-lanceolate, deeply pinnatifid, serrated. 
V enation — Midvein sinuous, lateral veins branched. 
Fructification — Clusters of capsules near the extremity 
of each vein, upon a membranous envelope. 
Habitat — Clefts of stone, in walls and mines ; attaining 
the greatest perfection in wide fissures of rocks. 
Locality — Plentiful about Matlock, Buxton, and in all the 
limestone districts : occasionally on sandstone. 
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