No.2 is a great example of a burl. Burls seem to be very common amongst Australian tree species. They are highly prized by wood workers for their unique grain patterns.
It is generally thought that stress due to climate, damage, and plant viral infections trigger burls.
No.2 is interesting in that the burl is near ground level. However they can occur at any height. Whilst they are generally seen above gound, they may also show up on tree roots - obviously only exposed when trees are blown over or are removed from the ground.
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Great set of B&W images Aguinaldo.
