Lateral roots in dicots are endogenous in origin and they are formed by
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Origin of Lateral Roots The lateral roots are endogenous in origin (from a deeper layer). The seat of its origin is cells of pericycle, usually opposite a protoxylem group, become meristematic and go on dividing periclinally and anticlinally. Lateral Root showing the Vascular Connection between it and the parent Stele. Lateral roots are produced in a definite pattern. The youngest roots are closing (proximal) to the apex. The pattern of lateral root production is readily observed with tap root systems. The tap root can also be called the primary root while its branches are called secondary or lateral roots. The origin of lateral roots can be unraveled for species that have fibrous root systems. A clear pattern emerges with careful study. The hump penetrates into the cortex, and emerges as a lateral branch. Later, the hump differentiates into 3 regions of the root apex- dermatogen, Periblem and Plerome. Finally the lateral root comes out. The number of lateral roots corresponds to the number of xylem bundles.
Lateral roots are formed in the outermost cell layer of the vascular cylinder in the root. This region is called the pericycle. The vascular cylinder is made up of the xylem and phloem and it is found in the centre of the root. The roots then become meristematic and continue dividing periclinally (parallel) and anticlinally (vertical).