The Virtual Petrified Wood Museum.  Dedicated to the Exhibition and Educational Study of Permineralized Plant Material
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Dicot Pore Distribution
This fossil hickory specimen (genus Carya) from Oregon exhibits a ring-porous pore distribution. The earlywood vessels are relatively large, while the latewood pores are much smaller in diameter. The image was taken at 20x.
This fossil live oak specimen (genus Quercus) from Oregon exhibits semi-ring porous pore distribution. The growth rings are not distinct; however, the pore size grades from larger to smaller across a growth ring. This image was taken at 20x.
This fossil beech specimen (genus Fagus) from Oregon exhibits diffuse porous pore distribution. The pores are pretty much the same diameter across the entire growth ring. This image was taken at 20x.

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