The xylem typically lies on the adaxial side of the vascular bundle and the phloem typically lies on the abaxial side.
From the en.wikipedia.org
Detail of a single vascular bundle from a transverse section of the mature stem, embedded in celloidin and stained with safranin and fast green.
From the sciencedaily.com
The proliferating fungal mycelium then destroys the plant ovary and connects with the vascular bundle originally intended for seed nutrition.
From the en.wikipedia.org
Apoplastic transport uses diffusion of transported molecules through the cell wall all the way from the root surface to the endodermis cell sheet that surrounds the vascular bundle.
From the nature.com
The roundworms inject a protein cocktail into a single plant cell of the vascular bundle system, causing the plant cell to merge with neighboring cells and start producing food for the worm.