Hi Marie: I can't really identify the fern you described, so go ahead and send along more information, and maybe we can help you further.
I'm glad that your transplanted fern is doing well, but I am a bit concerned about the fern having been "rampant" in Florida. There are several ferns that have become invasive and threaten native plant communities in the wild. If the plant you have is the Tuberous Sword Fern or a vining type such as Japanese Climbing Fern, then you may well contribute to adding yet another noxious plant to the already long list of invasives in Maryland. I know you don't want to do that, and why take the chance? I suggest that you try to grow the plant indoors, and think twice about growing this plant outside! I wouldn't share the plant with anyone, just to be on the safe side. I know this sounds rather hard-line, but there are many other good plants out there that won't escape. I am including several websites that describe the ferns I mentioned, and also Maryland's list of culprits. Thanks for your question and I'll get off my soapbox now.