Scientist Haberland (1914) divided dividing tissue into three parts according to location.
(i) Apical meristem: The dividing tissue located at the apex of the plant root and stem is called apical meristem. These are primary dividing tissues. It divides and causes the plant to grow in length. So the dividing tissue at the top is called growing point.
(ii) Lateral meristem: The dividing tissue which is located longitudinally along the sides of the root and stem of the plant is called lateral meristem. It causes secondary growth. It increases the height or width of the plant. Eg- Cork cambium, Interspherical cambium etc.
(iii) Intercalary meristem: The dividing tissue located between two permanent tissues is called intercalary dividing tissue. They are primary dividing tissue. It is present in the leaves, midrib, apex and flower buds of plants. Plants include rice, wheat, bamboo, grasses, horsetail (Equigitum), pine etc.