Here is another shot of the fern. Notice the liana-like growth pattern.

I agree with fatamorgana: I don't want to cut it down if that's not what it is. I took a few more pics to see if it helps. Fata, you are right about it being more than one plant. There are three. Here is a pic of the three "trunks." Here is a picture of some new growth on the medium-sized one. Here is one "frond/branch" in almost its entirety. And this picture shows where the "fronds/branches" attach to the main stem or trunk.

Thanks, Linda, that looks like it may be the one. I like the "thumbs" on the end of each frond, and how airy it looks. Whew- I just looked up some fern terminology...and realized that I need to learn them, as well. So many plants...so many terms...so much to learn...so much fun (-:

Looks like it could be Cinnamon fern. If so, they will send up a center frond that turns golden (it is the fertile part). If you can see spores on the backs of the fronds, then it is not Cinnamon fern.