Cystopteris fragilis
Brittle Bladder-fern
Leaves tufted, 15 to 30 cm tall
Finely cut leaflets
Dentate pinnulae, highly variable
Circular sori
WOODSIACEAE
= ATHYRIACEAE
genus Cystopteris
Growth in spring, fructification in summer, fronds disappearing in late fall
Rocks crevices, boulders in sheltered sites, or in open if moisture is present. Up to an elevation of 2500 m
Widespread in the Vercors