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I don't think its Pleurotus cornucopiae. The cap shape doesn't look right and the yellow coloration looks more like aging/drying to me. It was found in Texas too.. Pleurotus pulmonarius seems more appropriate to me.
Both observations are Phyllotopsis nidulans.
Its Laetiporous species, one of what people lump together as chicken of the woods or Laetiporous sulphureus. Im not farmiliar with which ones occur in Australia.
Wow, stunning! The material ive seen pictured as C. disseminatus didn`t have that blue color tho.
The quality and age of specimen make it hard to be 100%, but im pretty sure this is Hypsizygus ulmarius.