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.
1 Veins. 2  Veins are elastic vessels that transport blood to the heart. 3  Veins can be categorized into four main types: pulmonary, systemic, superficial, and deep veins. 4  Capillaries. 5  Capillaries are extremely small vessels located within the tissues of the body that transport blood from the arteries to the veins.