Abstract
The unusual ultrastructure of a milky disease bacterium isolated from Aphodius tasmaniae is described and compared with a similar bacterium from Tipula paludosa. Both organisms possess an elongate sporangium with a small central spore, a multilayered exosporium, and longitudinally arranged extrasporal fibrils which arise from plates attached to the ends of the spore. The morphogenesis of the sporangium is described and illustrated for the organism from A. tasmaniae. It is suggested this organism and that from T. paludosa are closely related. Their taxonomic position remains obscure.
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