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Thanks to David, Chris, Paul and Jim for enlightening me on this subject. I take it, then, that although the outer surface of the bark has a steady arrival of fungal spores, they don't develop there, mostly due to the dry environment. The failure to develop is not due to any defences that the tree may be producing. If they can get inside the bark, by whatever means, they then grow. Some species will grow outward through the bark where they appear as "bracket" fungi. Is this more or less correct? Peter
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