Bubbling Trees

Last week during the height of the deluge, I had a look at the light and the tree adjacent to it, a Quandong, Elaeocarpus sp., was actually spewing foam from a number of fissures. It was oozing out and dripping down the side of the tree.

The tree is healthy and not rotten in any sense. In the morning there was no trace of the foam.

If anyone has an explanation for the above, please leave a comment. I'm mystified. I suspect it is an insect, perhaps a bug of some sort, but it just does not ring true.