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The Fine Structure of the Erythrocytic forms of Plasmodium Gallinaceum as Revealed by Electron Microscopy^*

Miodrag Ristic AND J. P. Kreier

Electron microscopic studies of ultrathin sections of the erythrocytic forms of Plasmodium gallinaceum revealed that this intracellular parasite feeds on its host cell by means of phagotrophy.

The body of P. gallinaceum is covered by a thin cytoplasmic membrane which in certain areas appeared as a double membrane. The nucleus of the parasite is enclosed in two distinct membranes and its content varies in density from electron-lucid to more dense material which appeared to be agglomerates of small dense granules. Endoplasmic reticulum, food vacuoles, vacuoles surrounded by double or single membranes, and pigment (hemozoin) were visible in the cytoplasm of the parasite.

P. cynomolgi were not stained by fluorescein-labeled antibody which stained P. gallinaceum intensely.

^* This investigation was supported in part by a research grant AI-0315-05 from the National Institute of Allergy and Infectious Diseases, U. S. Public Health Service.

The authors are indebted to Miss Jutta Oppermann for technical assistance.

Assistant Professor, Department of Microbiology, Ohio State University, Columbus, Ohio.