Since I wasn't successful with my first experiment, I'm probably not the best one to ask. I do remember seeing the east side of a huge oak tree in Biloxi covered in small fern fronds. They were close to the bottom ten feet of the tree, in mostly shade, and conveniently in my brother's yard. I just had to have some to take back to Texas! Had I known better, I would have pried some of the oak bark with the fern. Instead, I carefully "yanked" the fern off the tree. I carried it home in a plastic container, so it wouldn't dry out.
You know the rest of that....