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Resin duct in fossil Pinus wood
 The three small holes are the remains of vertical resin ducts in fossil wood of Pinus. In most cases the resin canals are poorly preserved.
Wood from the Upper Miocene of Eschweiler (Germany).
Transverse section.
Magnification 25x
Resin duct in extant Pinus wood Vertical resin ducts in extant Pinus wood.
Magnification 25 x
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