medullary ray

American  

noun

Botany.

1. (in the stems of woody plants) one of the vertical bands or plates of unspecialized tissue that radiate between the pith and the bark.

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medullary ray British  

noun

1. any of the sheets of conducting tissue that run radially through the vascular tissue of some higher plants

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Etymology

Origin of medullary ray

First recorded in 1820–30

Example Sentences

In many of these cases the dying-back of the twigs is expedited owing to the mycelium invading the medullary rays and wood vessels, and so obstructing the transpiration current.

From Project Gutenberg

It is also traversed by medullary rays, Mr, which are continuations of those in the wood.

From Project Gutenberg

The medullary rays usually consist of a single tier of cells, but in the Pinus type of wood broader medullary rays also occur and are traversed by horizontal resin-canals.

From Project Gutenberg

A longitudinal section made from bark to centre, as when a log is "quarter-sawed," shows a full side view of the "medullary rays."

From Project Gutenberg

MR, medullary rays, lines between the bundles connecting the pith and the cortex.

From Project Gutenberg