I found this fungus growing on top of the Eucalyptus stump behind my house. The growth pattern reminds me of the Chicken of the Woods mushrooms in the Laetiporus genus. However, it has none of the bright sulfur yellow color that is a major characteristic of that edible fungus.
The spores are white to cream (changing as they get older?). The only Laetiporus I can find with white spores *does* grow on Eucalyptus, but is still much more yellow in color (see photos here).
I will be doing a little dissection and adding to this post. Stay tuned!