2017
NZ0881 : Helical structure of Sweet Chestnut tree grain revealed
taken 6 years ago, 3 km from Middleton Bank Top, Northumberland, England
Helical structure of Sweet Chestnut tree grain revealed
Strictly speaking it's probably a section of a conical helix since tree trunks taper. Apparently this phenomenon isn't confined to Chestnut trees; Scots Pine and Ponderosa Pine can also grow like this. Does the helix climb in a clockwise direction in the southern hemisphere?
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