Not a fern!

Not a fern!

Observation - Not a fern!. Description: Beautiful fern-like plant growing in rockery/gravel garden in park. Ignore the yellow corydalis growing through it! Not sure if deliberately planted but can't identify from my books.

Beautiful fern-like plant growing in rockery/gravel garden in park. Ignore the yellow corydalis growing through it! Not sure if deliberately planted but can't identify from my books.