That actually doesn't matter. Even if given a natural species to host, there's no guarantee the clowns will host the anemone. Bulbs and long tentacle anemones are largely accepted as substitutions to clowns that naturally host a different species. Example: Occelaris clowns naturally host carpet and ritteri anemones, however will host a bulb or long tentacle. Clowns have been seen to host things that are completely different such as a fake plant or an algae magnet...lol They'll try to feed it too!!
So, it really depends on the individual fish. Give it time. If the clown finally hosts the anemone, great. If not then it's nothing more than what one might call a disappointment, but both will live just fine without each other.
...Carpet and Ritteri Anemones are rather difficult. Read about them first before attempting to keep these species.
We, as a people, know so much more about outer space than we do about our own oceans. This lack of knowledge can very well spell the dangers that lay in wait for us.
The oceans surely would swallow us before a rock comes down to smite the planet of it's life.