Hi Helen, That's pretty weird, but your explanation seems plausible, that there has been an elkhorn plant growing on a casuarina trunk in which another casuarina has germinated and grown, then the elkhorn died and rotted away, leaving a knot of casuarina roots attached to the first tree. Was the top of the smaller stem alive or dead? Hard to see how it would be obtaining any nutrients with its roots wrapped around the larger casuarina trunk like that, so I'm assuming it would have died when its supporting fern did.
It is very strange Jackie and I'm pretty sure some of them were still alive. I've just uploaded a cropped photo to this record which actually shows a live elkhorn and live casuarina needles on the growth.
Yep, well a couple of live elkhorn leaves anyway. It looks like the bulk of it has died. Quite a few plants do get started on this sort of material that traps nutrients (pinkwood trees on tree fern trunks for example) but they usually rely on getting some roots down to the ground eventually.
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