How to Mount a Staghorn Fern tells us how to put it on a wall. My only concern is that the moisture will seep into the hosiery at the back of the mount plate, and allow mildew to grow. The idea is good, though. With a few simple modifications, that problem could be completely avoided.
Be sure to check out the other used hosiery ideas, by clicking used, which can also be found in the right column, under Popular Topics.