Probably Hypolepis species, likely H. punctata, but to be certain it's necessary to see the spores and the stipes (stalks) (pale or reddish?) And there's an outside possibility it's Diplazium australe but that's much less likely
Let's make the ID certain, then. It's the sort of location I'd expect to find it, and I'm 90% sure of the ID. If correct, it has a spreading rhizome and new fronds will appear very close by, so we can correct the ID if necessary.