Other than epidermal and vascular tissues, the tissues forming the other parts of the plant body are called ground tissues. Most plant tissues are ground tissues. It is composed of parenchyma tissue. However, collenchyma and scherenchyma tissue can also be formed. This tissue system originates from periosteum dividing tissue. In the roots of all plants and in the stems of dicotyledonous plants, the ground tissue system is divided into two regions. Exosteal region and intraosteal region.