oderm meristem:It is the outermost layer of the young growing region which develops to FORM EPIDERMAL tissue system.(ii) Procambium meristem:It is composed of narrow, elongated, prosenchymatous, meristematic cells that gives rise to the vascular tissues system.(iii) Ground Meristen:It is composed of large, thick-walled cells which DEVELOP to for ground tissue system, i.e. hypodermis, cortex and PITH.IV. Classification on basis of plane of divisions:The growth pattern and plane of division of meristematic tissue is important to govern the mode of growth.These tissues can be divided into three types:(i) Mass meristem:In such meristem, cell divisions occur in all planes resulting in an increase in volume. It can be observed in meristems of cortex and pith.(ii) Rib or file meristem:The cells divide only on one plane e.g., formation of filaments in algae.(iii) Plate meristem:These cells divide in two planes resulting to an increase in the area of an ORGAN e.g. Leaf formation.