Are you sure this is a fern? It lookes suspiciouly like wild parsely,
which is a really bad thing....noxious as hell.
I just went out with a torch and looked at one that I neglected to
kill and it looks like it, from your picture.
If it be wild parsley, DO NOT pull it barehanded or get its sap on
your skin and then expose yourself to sunlight. Nasty stuff, really
nasty what it does to skin.
That is definitely not a fern. I'd guess its a plant in the family Apiaceae,
possibly hemlock (genus Conium). There are some large, noxious
plants in that family, some of which can cause phytophotodermatitis
if the sap gets on your skin.
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