Abstract

Cultures of a red halophilic archaebacterium exhibiting a complex morphology and cellular morphogenesis were obtained on a medium containingHalobacterium cutirubrum cell lysate. On primary culture the organism grew as an amorphous cellular mass 20 or more micrometers in diameter and underwent multiple internal cellular subdivision to produce a multicellular structure consisting of cuboidal cells of submicron dimensions. These disaggregated, elongated, cells became motile and multiplied by budding, thereby resembling the eubacteriumGeodermatophilus. The new isolates are identified as archaebacteria on the basis of their response to antibiotics, probable absence of peptidoglycan, and the presence of ether-linked lipids.

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