Novel polyether antibiotics X-14868A,B,C,and D produced by a Nocardia. Discovery,fermentation,biological as well as ionophore properties and taxonomy of the producing culture.

Abstract
A hitherto undescribed Nocardia culture was isolated from an Australian soil sample and found to produce novel polyether antibiotics X-14868A, X-14868B, X-14868C and X-14868D.