Never seen one that large if so
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I’m not an *ologist of any kind, but it looks like a tree knot to me
https://www.publicdomainpictures.net/en/view-image.php?image=61663
That’s a burl (basically tree cancer), and any woodworker would give you their right arm for one that size.
It’s not really cancer tho. Some trees reproduce through burls, such as sequoias (redwood). The burls contain seedlings that sprout when the tree falls or spread with flooding or forest fires.
Looks like burl wood
Chonka
Doesn’t chaga only grow on dead birch trees?
