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.
Palms usually survive, but will exhibit interveinal or general chlorosis on the newest leaves. Interveinal chlorosis is basically green veins surrounded by yellow tissue, and this is usually seen on newest leaves first. As the iron deficiency becomes more severe, new leaves will show extensive tip necrosis, and there will be a reduction in leaf size.