There is one orchid species which only (?) grows epiphytically on stag-horn ferns - but memory is not ready to divulge the name to me. I have not seen that one ( whatever it is ) but I have seen Dendrobium delacourii growing on it - but that species is so opportunistic, it would probably grow on my boots if I left them there long enough ; in an area which had been burnt through in a forest fire, I saw it growing lithophytically , terrestrially, epiphytically, and also - whatever the right name is - we'll have to invent one (!) growing on stags horn fern.
They are nice things ; if you ever get to Paris (France, not Paris Illinois or whatever - you don't mind me pulling my transatlantic cousins legs , as a mere limey, I trust ? ), one of the famous name nurseries there has a specimen several feet across, which has been growing there for very many years ( but without any orchids on it ).