Yes, it is a fern.
Most likely a very common variety. Couldn't tell you what specific kind. I don't know ferns. Most of them look alot alike to me.
Where it grows would tell you what general type at least.
Was it growing in a marshy, wooded, or brushy area?

Here is a site that may help:

Here is a link that might be useful: Ferns Rick's Custom Nursery

I seems to be Pteridium aquilinum.
Rgds

Aka Common Bracken.

My first thought was bracken, but no idea as to the flora of Romania, I was not going to stick my neck out.

Edited because I still can't spell Romania

This post was edited by thefof on Sat, Sep 13, 14 at 8:54