Three Australian isolates of “,” ten strains of “” from North America, Australia, and Europe, and two American strains of “” were investigated by the deoxyribonucleic acid (DNA)-DNA hybridization (renaturation) method to determine their genetic interrelationships and their levels of relatedness to recognized members of the family Pohl 1981. Our results confirmed that “,” “,” and one of the “” strains studied represent one genetically homogeneous species. This species exhibited up to 41% DNA relatedness to , whereas only insignificant levels of relatedness or no measurable DNA binding was observed with the type species of the genera , and and with , and “.” On the other hand, one of the “” strains studied (Hoerlein strain M650-1343) was included in the species “” (DNA binding value, 91%). So far, only low levels of genetic relatedness with “” and currently recognized members of the family have been detected. The problems of the generic affiliation of the “” group, , and “” and the phenotypic differentiation of these organisms are discussed.


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