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.
This pattern is made up of much larger, primary veins that connect to the leaf stem as well as smaller, secondary veins. The larger veins' main purpose is to carry water from the stem into the leaf, while the smaller veins spread it throughout every part of the leaf. The smaller network of veins also collects chlorophyll created in the leaf, which the larger veins then transport back to the main part of the plant. Each species of plant has a unique pattern of veins in its leaves, varying in the density of the network and the distance between the larger veins. Some scientists have begun studying exactly what this pattern says about a plant and have made a number of conclusions.