WOW Dean you sure like to find the tricky ones..... I am not overly familiar with the polypores but this one fits nicely with a Rigidoporus species which forms tiers on dead stumps of eucalyptus. Was your tree dead or alive? This is a great image, by the way, very well captured.
As this specimen appears to be immature and a definite id can't be given with confidence I'm sorry it will just have to be placed under Polypore sp. A great looking specimen thank you for uploading it for us all to see. Hopefully some time in the future you may be able to record it in a more mature state..