in Anatomy of Flowering Plants by

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Vascular cambium is a thin layer of cells or strip between xylem and phloem present in the vascular bundle. It consists of two types of cells they are;

  1. Fusiform initials: They are elongated cells with tapering ends
  2. Ray initials: They are isodiametric cells.

Vascular cambium is present parallel to the plant axis and the cell wall is thin and cellulosic. The cell wall contains pits, vacuolated cytoplasm and a large nucleus.