The cambium present in the vascular bundle is known as the fascicular cambium. The fascicular cambium within each vascular bundles is interconnected by a cambial tissue known as the inter fascicular cambium. This fascicular and inter fascicular cambium together forms a ring of cambium. The ring of cambium later matures to form the vascular cambium. Vascular cambium is a bifacial cambium due to its activity. I.e. this cambium can produces the secondary xylem internally and the secondary phloem externally.