Fungus and Rings of the Log

This tree trunk had been cut a while back.  I was interested to see that some fungus was growing on the cut surface of the wood.  However, there was clearly something about the outer rings of the wood that provided nutrients to the fungus that the older wood inside did not.  The growth was focused on the outer rings only and there was absolutely no fungus on the inner layers.  I wonder what the reason for this was.  Any suggestions?

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