#vascular bundle

• Amphicentric — Disposed concentrically on both sides or around a central core; in plant histology and anatomy, it describes a type of fibrovascular bundle where either the woody tissue (xylem) or the phloem completely surrounds the other structural component. Additionally, in neurology or optics, it can refer to fibers or light beams converging or diverging symmetrically around a common focal point.
• Atactostele — A type of stele or central cylinder structure of the stem, characteristic of monocotyledonous plants, in which the vascular bundles are scattered irregularly throughout the ground tissue, without a strict concentric arrangement. As an adjective, it describes a plant stem or vascular system featuring this asymmetric and dispersed anatomical configuration.