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.
There are many advantages of having a network of veins in a leaf, Firstly there are a strong network of veins which support the lamina. Vascular bundles (veins) are made os veâ¦ssels and sieve tubes which is advantageous, becausen it allows substances to pass through the leafy system.