Leaves from 15 to 40 cm tall, on a creeping rhizome

Blade triangular, light green

The two lower pinnulae swallow-tail shaped, very characteristic

Sori round, no indusia

Growth in spring, fructification in summer, disappearing in fall

Moist slopes on acidic soils, up to an elevation of 2000 m

Seems to be rare in Vercors. One site known at "Les Ecouges": shaded slope with sandy soil (miocene mollasse )