|ground tissue |
The tissue of a plant other than the epidermis, periderm, and vascular tissues, consisting primarily of parenchyma, and (in lesser amounts) of collenchyma and sclerenchyma. Cortex and pith are subtypes of ground tissue.
In the vascular bundles of the ground tissue the bundle-sheath is rather prominent and the phloëm portion is well developed.
It is sharply separated from the ground tissue by a row of small cells, called the “bundle sheath.”
A third series is disposed around a fairly large amount of ground tissue, which may or may not have a cavity in the centre.
The ground tissue is composed of large, loose cells, which in the older roots are often ruptured and partly dried up.
The outer cells of the ground tissue in the green branches contain chlorophyll, and the walls of some of them are thickened.
Two isolated bundles, one in front and another at the back of the ground tissue, are found.
The bulk of the ground tissue is made up of rather large, loose cells, the outer ones containing a good deal of chlorophyll.
The cells of the ground tissue lying just inside the vascular bundles are all very much thickened.
There is a bundle sheath of much-flattened cells separating the fibro-vascular bundle from the ground tissue.
Two rows of vascular bundles surround a fairly large amount of parenchymatous cells of the ground tissue.