ClipArt ETC
"Diagram showing the transport of food through the sieve tubes, medullary rays and tracheal tubes, and its storage in the parenchyma cells of the wood and bark. The black bodies in the cells indicate stored food." -Stevens, 1916

Sieve Tube Food Transportation

"Diagram showing the transport of food through the sieve tubes, medullary rays and tracheal tubes, and…

"Longitudinal tangential section of [maple], showing the ends of the medullary rays." - Century, 1889

Longitudinal Tangential Section of Maple

"Longitudinal tangential section of [maple], showing the ends of the medullary rays." - Century, 1889

"Longitudinal radial section through the wood of a branch of maple one year old: P, pith; B, bark." -Century, 1889 In botany, Medullary rays refer to a characteristic 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 transmission of sap.

Medullary Rays of Maple

"Longitudinal radial section through the wood of a branch of maple one year old: P, pith; B, bark."…

A characteristic found in woods. They are the radial ribbons extending vertically through the tree across and perpendicular to the growth rings.

Medullary Rays

A characteristic found in woods. They are the radial ribbons extending vertically through the tree across…

"Diagram showing some types of unusual growth in thickness...C, portion of a cross section of stem of Gnetum scandens; 1, 2, and 3 are successive rings of growth; m, is the pith; b, is a sclerenchyma ring. The xylem portions with the exception of the larger tracheal tubes are shaded, while the medullary rays, phloem and tissues intervening between the rings of growth and the outer cortes tissues are left white." -Stevens, 1916

G. Scandens Unusual Stem Growth

"Diagram showing some types of unusual growth in thickness...C, portion of a cross section of stem of…

"Diagram showing how the vascular bundles anastomose around the medullary rays. The gaps represent the rays." -Stevens, 1916

Vascular Bundles

"Diagram showing how the vascular bundles anastomose around the medullary rays. The gaps represent the…

"Diagram showing by the arrows how the water can flow tangentially around a plant without traversing the medullary rays, which are indicated in black." -Stevens, 1916

Water Flow in Plants

"Diagram showing by the arrows how the water can flow tangentially around a plant without traversing…

"Tangential section of wood of Liriodendron tulipifera, showing frequency of contact of medullary rays with a tracheal tube. f, medullary ray; g, tracheal tube." -Stevens, 1916

L. Tulipifera Wood

"Tangential section of wood of Liriodendron tulipifera, showing frequency of contact of medullary rays…