Abstract
Twenty-eight bacteriophages from Rhizobium trifolii were found to be divisible into eleven distinct morphological groups. Four groups had long, non-contractile tails, five possessed a contractile tail, and two had tails of uncertain structure. The groups could be further distinguished from one another by head size and tail detail. Isolates of the same morphological type had similar plaque characteristics and host range. All types contained DNA.

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