Species of eight bacterial genera have been proposed in the literature as leaf-nodule symbionts: , and The first four are discounted either by rules of nomenclature (i.e., ) or because modern generic limits exclude the nodule species originally placed in them. Species of the latter four genera have been isolated recently by several investigators. Even though some of these investigators favor the hypothesis of one bacterial symbiont in all leaf-nodulated plants, all four genera must still be considered as containing legitimate symbionts. (Miehe) comb. nov. is proposed as the legitimate name of the type species of Knösel to replace the illegitimate name Knösel.


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