The interfascicular cambium is a secondary meristematic tissue.
Meristematic tissues are responsible for the growth and development of plants. They are composed of undifferentiated cells that have the ability to divide and give rise to new cells. Primary meristematic tissues are formed during the embryonic stage of plant growth, while secondary meristematic tissues develop during the later stages of plant growth.
The interfascicular cambium is a type of cambium, which is a secondary meristem. It is located between the vascular bundles, or fascicles, in the stem of a plant. The primary meristematic tissue in the stem is called the procambium, which differentiates into the primary xylem and primary phloem. The interfascicular cambium arises from the dedifferentiation of parenchyma cells in the stem's ground tissue and forms a continuous cylinder of meristematic tissue that connects the cambium in the vascular bundles.
The interfascicular cambium plays a role in secondary growth, which involves the thickening of stems and roots in woody plants. It actively divides to produce new cells that differentiate into secondary xylem (wood) on the inner side and secondary phloem on the outer side.