The differentiation of the cells derived from the primordial meristem formed protoderm, ground meristem and procambium strand.
其衍生细胞分化为原表皮、基本分生组织和原形成层。
Procambium (procambium strand) The layer of cells that gives rise to the vascular tissue.
原形成层（原形成层束）：形成维管组织的一层细胞。
Cells of the procambium and ground meristem are more vacuolated than those of the protoderm.
原形成层和基本分生组织的细胞比原表皮层细胞更加液泡化。
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