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.
NODE - point at which leaf stalk is attached to stem. PETIOLE - leaf stalk, extends from stem to leaf blade. PRIMARY VEINS - the most prominent veins of a leaf. SECONDARY VEINS - those veins which depart from the primary veins; they may or may not extend to the leaf margin. SINUS - angle or valley between two lobes; may be rounded or angular. STEM - main branch of plant.