Fern ID?

[SubRosa]

This fern just started growing in my paludarium a few weeks ago. I have no idea where it came from, but it's rather nice. It's the dark green leaf right in the center of the pic. The leaf (frond) is on a wiry stem ala Maidenhair Fern. Any ideas?

 

[SubRosa]

Here's another that's getting weedy:

 

[SubRosa]

Pic of the rhizome on the first one:

 

[theplantman]

1- Phlebodium aureum
2- Hard to tell but either hay-scented fern, Athyrium, Dryopteris, or Thelypteris. For a better ID look at the sori.