Abstract
A vesicular intracytoplasmic membrane system is demonstrated in bacteroids from the leghaemoglobin filled zone of effective Trifolium subterraneum nodules after KMnO4 and OsO4 fixation. The system appears to be present in all mature bacteroids from this zone, and is derived from tubular invaginations of the plasma membrane of the bacteriod. A granular substance similar to the bacteroid cytoplasm is found in the vesicles which are bounded by a tripartite membrane approximately 80 A wide, while the interspace between the vesicles is filled with a material of similar appearance to that in the interspace between bacteroid plasma membrane and cell wall.
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