Summary: Isolated colonies of , grown anaerobically for 2 d before exposure to aerobic conditions, developed into unique elongated fruiting body-like structures which reached a height of > 10 mm. The elongated structures were surrounded by an extracellular fibrous substance which formed a tough pliable sheath on exposure to air. Vegetative and sporulating cells were restricted to the basal region of the structure; the trunk region contained mainly free spores and a small number of granulated or lysed cells. Colonies maintained under anaerobic conditions did not produce the elongated macroscopic structures.


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