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.
That includes most shrubs and deciduous trees. This is the classic leaf, a skeleton of veins with a membrane between them. These leaves are delicate, but very efficient. They have a large surface area thatâs great at catching the sunlight and exchanging gases, the main functions of this type of leaf.