periclinal

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periclinal

(of planes of cell division in plants) parallel to the surface of the plant.
References in periodicals archive ?
They are divided periclinally, cause to formation of inner sporogenous cells and outer parietal cells.
Instead, it has a centrally located "central mother-cell zone" of randomly dividing cells and a "peripheral zone" in which cells divide anticlinally (perpendicular to the surface) so that layers are maintained but also occasionally divide periclinally.