Medullary ray (botany)

The wood of Quercus robur

Medullary ray is a cellular structure found in woods. In this context the term refers to radial sheets or ribbons extending vertically through the tree across and perpendicular to the growth rings. Also called pith rays or wood rays, these formations of primarily parenchyma cells allow the radial transport of sap and are essential in the process of tylosis. In quartersawn material, where the wood is cut into boards with the growth rings roughly perpendicular to the face of the board, the medullary rays often produce beautiful figure such as silver grain, medullary spots, pith flecks, etc.^[1]

References

1. Corkhill, Thomas (1989). The Complete Dictionary of Wood. Dorset Pr. ISBN 0-88029-318-7.