Some strains of S marcescens are capable of producing a pigment called prodigiosin, which ranges in color from dark red to pale pink, depending on the age of the colonies.
Vascular Tissue: the xylem and phloem in leaves are confined to vascular bundles or veins. Veins are surrounded by a layer of cells call the bundle sheath. The bundle sheath can be composed of parenchyma, colenchyma, or fibers.
A: The primary purpose of the veins in a leaf is to carry food and water throughout the leaf. The veins also have a secondary purpose, which is to help provide support for the rest of the leaf. In many types of leaves, the veins form a large pattern that resembles a net.