The absence of prominent cluster bracts over the flower spike rules out X. australis, the upper aspect of the leaf appears flattened to concave in some, this is also inconsistent with X. australis, therefore this is likely either X. resinosa or the affiliated X. concava.
That 'hoof' shape and the colour of pores indicates a Phellinus sp. maybe P. robustus. This genus causes white rot and is found on both dead or living wood of both angiosperms and gymnosperms . Ganoderma have white pores and also cause 'white rot' and grow mainly on angiosperms. Good images, thank you.
This looks very much like a remnant of Laetiporus portentosus that has fallen from a nearby tree. These remnants often look like styrofoam because what was originally a bracket has been eaten by insects. Maybe after the fire this was one of the few food sources left for the insects to eat. If you look under species and go to fungi there is some information about this fungus. Unfortunately the image there is not all that representative of the fungus on a tree.
Xanthorrhoea australis has a definite trunk above ground. It is extraordinarily difficult to ID the species with underground trunks, even in flower and with the bracts around the flowers and between the flowers intact. One of the characters in the Plantnet key is th relative length of flower stalk and flower spike.
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