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A vesselless fossil wood was discovered in the Miocene Yanagida Formation in the Noto Peninsula, central Japan. This fossil
has distinct growth rings with gradual transition from the early- to the latewood ; tracheids, which are called 'usual traeheids'
here, constitute the ground mass of the wood and have typical scalariform bordered pits on radial walls in the earlywood and
circular sparse pits on those in the latewood ; rays are 1\2-4 cells wide and heterogeneous with low to high uniseriate wings;
axial parenchyma strands are scattered in the latewood. This wood has a peculiar feature; sporadic radial files of broad tracheids
whose tangential walls have crowded alternate bordered pits. The radial walls have crowded half-bordered pits to ray cells,
but no pits to the usual tracheids. Among all of the extant and extinct angiosperms and gymnosperms, these unusual tracheids
occur only in Tetracentron. From these features, we refer the fossil to the extant genus Tetracentron, and name it T. japonoxylum.
A revision of homoxylic woods is made for comparision with the present fossil. Tetracentron japonoxylum is the only fossil
wood of Tetracentron. 相似文献
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