Like other organisms, plant cells are grouped together into various tissues. These tissues can be simple, consisting of a single cell type, or complex, consisting of more than one cell type. Above and beyond tissues, plants also have a higher level of structure called plant tissue systems.There are three types of tissue systems: dermal tissue, vascular tissue, and ground tissue systems. The dermal tissue system consists of the epidermis and the periderm.The epidermis is generally a single layer of closely packed cells.ylem and phloem throughout the plant make up the vascular tissue system. They allow water and other nutrients to be transported throughout the plant. Xylem is consists of two types of cells known as tracheids and vessel elements.