Plum like fruit that grows on tree trunk

Hi, a friend is working in Northern NSW (Australia) where this fruit tree is growing. He said the fruit tastes similar to a plum, both sweet and sourish, with dark red flesh. The one in the photo had two seeds and the fruit grows directly on the trunk, similar to a japoticaba I guess. Any ideas?[/url]
Leaves/trunk ( photo / image / picture from Snap's Garden )


Plum like fruit ( photo / image / picture from Snap's Garden )


Red flesh ( photo / image / picture from Snap's Garden )


The tree from a distance ( photo / image / picture from Snap's Garden )

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Perhaps Davidson's Plums (Davidsonia Pruriens).

Jerry

 

Thanks Jerry, I think you're probably right. I didn't see the tree for myself, but will check if the fruit grows on a long stem, on the trunk.

 

Yes that is correct...well done Jerry.I was growing one a few years ago but too sour for us.

 

Well done Jerry, I googled cauliflory plants and couldn't get anywhere close.