A new species of Actinosporangium is described, for which we propose the name Actinosporangium vitaminophilum. This organism produces new antibiotics called pyrrolomycins and is characterized by pseudosporangia lacking sporangial walls, nonmotile spores, and a type I cell wall. It differs significantly from previously described species of the genus Actinosporangium in the cultural conditions necessary for pseudosporangium formation. The type strain of A. vitaminophilum is SF-2080 (= ATCC 31673).
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