Was this entirely under the earth and you dug it up, or perhaps found it in a bird scraping? Or do I see part of a stem attachment? It appears to be aged and weathered like an older fungus such as scleroderma.
@LyndalT thanks for the updates; sorry I can't give any better info on this. throughout the Eurobodalla we have found many decomposing puff or earth balls lately, which is what I suspect this may be, doesn't look like a truffle to my eyes. Hope Pam or Heino or perhaps another contributor may offer a comment.
My thought about this being non-fungal was prompted by there seeming to be virtually no change from 10 Aug to 24 Sept. I cannot say for sure what this is but the broken end between the fingers looks like wood so this might be some abnormal woody growth (like a woody tumour or canker). Moving away from the fingers you see a flat, featureless, white growth over the surface - possibly one of the so-called paint or skin fungi (or corticioid fungi to give the technical name) that grow on dead wood and for which it's impossible to offer an ID just from a photo. Naturally, I could still be wrong.
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