Abstract
Several forms of mycoplasma-like bodies (MLBs) were observed in electron micrographs of phloem cells from explants infected with aster yellows disease.The structures were found only in explants 11–25 days old, when the degenerating MLBs were first observed. They resembled those described by Anderson and Barile in 1965 for Mycoplasma hominis.A sequence of events in the degeneration of MLBs is postulated and morphological analogies with degenerating M. hominis are discussed.

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