What Wood Is That?
Rays help, too
When cells join to form a flat band of tissue that extends horizontally from its origin to the bark, it's called a ray. If the band happens to be several cells tall and wide as well, it's an aggregate ray. When a ray connects to the pith (innermost part of the tree), it becomes a medullary ray.
In commercial timber trees, only beech, the oaks, sycamore, tanoak (not a true oak), and red alder have large, conspicuous rays. In beech, the oaks, and sycamore, you can see them without magnification.
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