Unknown Fern

Unknown Fern

Observation - Unknown Fern - UK and Ireland. Description: Found growing on rock outcrop (sorry im not sure whether it was limestone or not). The fronds were relatively small, approx 20 cm in length. Any ideas which species this is?

Found growing on rock outcrop (sorry im not sure whether it was limestone or not). The fronds were relatively small, approx 20 cm in length. Any ideas which species this is?