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Medullary Ray

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medullary ray [me′dəl·ə·rē ‚rā]
(botany)
An extension of pith between vascular bundles in the plant stem. Also known as pith ray.
medullary ray, pith ray
medullary rays
In a cross section of a tree or log, one of the ribbons of tissue extending radially from the pith; may vary from microscopic to 4 in. (10 cm) or more in oak; used to store and transport food horizontally within the tree.
Medullary Ray 

a single or polystichous layer of parenchymal cells that intersect the lignin and bast of stems and roots of dicotyledonous plants. Medullary rays serve a storage function and transport matter in a horizontal direction.
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This types of sawing makes the wood rays in the red and white oaks, known as medullary rays, very conspicuous and gives an exemplary finish and richness to the end product.
Oak Interior Doors - Beauty and Strength by Sunil Punjabi / Home improvement and landscaping community
The reaction of the stain upon flakes or cells of the medullary rays, its effect upon the mass of wood fibers, and its greater absorption by the open pores or broken cell cavities, are all elements of great surprise that are very interesting and vary with different kinds of wood.
Wood Staining Basics by Lynette Tyson / Hobbies community
West said the veneer generally is sliced into quarters to produce "a distinct medullary ray or flake.
Pretty 'plane': American sycamore offers impressive yields by Kaiser, Jo-Ann / Wood & Wood Products
 
 
 
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