Dendrobium antennatum: Wiki tells me it grows in mangrove swamps and on savannahs, and I found this link to info about its' natural habitat in Australia:
Ceratobium antennatum — Antelope Orchid
So my next step will be to find out what other plants like to grow there. I have flasklings of this species.
Probably the same trees & other plants that relate to this one will relate to other Australian natives from the same region.