The P ring forms part of the basal body of the bacterial appendage known as the flagellum. It is known to be embedded in the peptidoglycan cell wall.Larry Barton (2026). 9780387207087, Springer Science & Business Media. . ISBN 9780387207087 Together with the L ring, it has the function of anchoring the flagellum to the cell surface.Moselio Schaechter (2026). 9780080961286, Academic Press. . ISBN 9780080961286