The Virtual Petrified Wood Museum.  Dedicated to the Exhibition and Educational Study of Permineralized Plant Material
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Sequoia Growth Rings
The tracheids making up the earlywood of this Sequoia are visible at 20x. The latewood tracheid diameter is not as visible. In general, a 20x loupe is needed to view the tracheids of gymnosperms. Tracheid diameters in gymnosperms range from 20 to 80 micrometers depending on the species.

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