bundle sheath

noun

, Botany.

1. a layer of cells in plant leaves and stems that surrounds a vascular bundle.

bundle sheath

1. A layer or region of compactly arranged cells surrounding a vascular bundle in a plant. The bundle sheaths regulate the movement of substances between the vascular tissue and the parenchyma and, in leaves, protect the vascular tissue from exposure to air.

Example Sentences

On account of this bundle-sheath the bundles are called fibro-vascular bundles.

From Project Gutenberg

In the vascular bundles of the ground tissue the bundle-sheath is rather prominent and the phloëm portion is well developed.

From Project Gutenberg

The larger vascular bundles consist of xylem and phloëm surrounded by a bundle sheath of a single layer of cells.

From Project Gutenberg

It is sharply separated from the ground tissue by a row of small cells, called the “bundle sheath.”

From Project Gutenberg

There is a bundle sheath of much-flattened cells separating the fibro-vascular bundle from the ground tissue.

From Project Gutenberg