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I wasn't aware of these trees until I tried to negotiate (and tripped up on) their exposed roots, and I must admit, I'm not too sure what species of tree they are. Regardless, they're able to grow in excessively sandy soils, and that's just as well because North Stradbroke Island is the second largest sand island in the world. I'm leaning towards a species of bloodwood, or perhaps mahogany (Eucalyptus acmenoides - white mahogany, yellow stringybark). Trees rather stunted with gnarled branches, and bark is rough, fibrous and flaky. Leaves rather broad with prominent rib, glossy dark green, and lanceolate. Rather small buds, but unfortunately not in flower (which makes for a more difficult ID). Root system shallow but extensive (photos 1 & 2).
Found at Point Lookout on North Stradbroke Island. Exposed headland area with native vegetation, extreme winds (at times), and salty air. Sandy soil, although much moisture retained by ground cover of mostly Austral Bracken (Pteridium esculentum) and one of the Asparagus weed species.