The other day, I was removing root suckers from a very old Hazel (Corylus avellana) and I noticed these:
No, I have no idea what they are.
They appear to be hard, round, nodules: about the size of garden peas, and scattered all along the base of the tree, where the base flares out.
I've never seen anything like this before, and a cursory internet search ("nodules on hazel tree" "hazel bark galls") didn't throw up any images of anything similar.
So they don't appear to be galls (which I would normally expect on leaves, not on bark, anyway), and they're not burrs, either.
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