I got this fern at a plant swap (aka Round Up) that some of us Texans have twice a year. It limped through an usually cold winter followed by an always unbearably hot summer and then an unusually warm winter and somewhat rainy late spring and late summer. It's in a pot within a pot and in a shady area. Not critical, but am curious to know what this fern might be. Caveat: skeeters prevented me from getting better pictures. Not my fault! I did want to show the underside of the fern. Will see if I can do it tomorrow.

Im starting to like ferns! Just a guess but maybe a sword fern (Nephrolepsis) I have a Nephrolepsis exaltata (boston fern) It looks to have the same leaf structure as yours just smaller.
Edit: Nephrolepis

It is a Nephrolepis. It might be Boston Fern:
Boston Fern (Nephrolepis exaltata)
http://ferns.brit.org/?q=node/...

It reminds me of a lot of the Southern Sword Fern (Nephrolepis cordifolia) which is invasive here in Florida and so very difficult to eradicate. There are some good photos on this page showing the differences: http://edis.ifas.ufl.edu/ag120

Thanks, y'all for your suggestions. After looking at some of the pictures, I kinda think it might be a Southern Sword Fern. I don't think a Boston fern would have survived outside the year we actually had a nasty winter here in Dallas. Haven't looked at all of the links but will do. And maybe I'll find a nice place to plant it so it's not in a pot within a pot.

What constitutes a nasty winter in Dallas these days?

Temps in the teens for multiple days in a row. Snow and ice. Last year was a good year but think it was 2 years ago that we had the nasty one. Freezing weather before Thanksgiving. That was rare. Was going to a party a few weeks later. Cabs weren't driving. Uber not driving. So took me 30 minutes to scrape all the snow and ice off my car. Made it to the party, a few miles away, about an hour late. Only a third of the invitees were there (500 people out of 1500) due to roads and canceled flights. When I got home I couldn't get up the mild slope of my driveway. So that was an unusually bad winter. Last year was unusually warm. Ya just never know.

Now that I think about it, my unknown fern was sitting by my front door during that nasty winter. Unprotected. The pot it was in was too heavy so it sat as far as I could carry it when I got it. In the spring I threw the remains in a small pot and forgot about it. Months later I noticed it and was shocked that it was still alive. Moved it once more and it's still growing as y'all can see from the pics. Now that my memory is returning I'm even more curious as to its identity.

Based on your responses above I think you should still consider Boston Fern.

Greenthumb99 - except for summer, I always thought that Boston ferns were indoor plants. Admittedly I've been wrong before, but can they really survive snow and ice?

I found a better picture of it and if I find it again I will post it.

There is so much genetic variation in Boston ferns, and plants are more tenacious than we usually give them credit for that it should remain under consideration. Once it dies back to the ground, snow or ice is irrelevant in and of itself and can serve to moderate the temperature of the soil below. One of the nation's major fern growers, Casa Flora, is just off I-45, 4 or 5 miles south of downtown Dallas. If you stop by you might get lucky and encounter someone who would ID it for you, Many professionals delight in sharing their knowledge with "the masses".