The chloroplasts ofVacuolaria virescensCienkowsky are present in large numbers between the cell membrane and the layer of cytoplasm surrounding the nucleus; they are disc‐shaped structuresca.3–4 μM long by 2–3 μM wide. Chloroplast bands consist of 3 opposed thylakoids with adjacent bands frequently interconnected. External to the girdle band is a chloroplast envelope separated from the cytoplasm by endoplasmic reticulum; there is no immediately apparent continuity between this endoplasmic reticulum and the nuclear envelope. Small electron‐dense spheres in the chloroplast stroma are thought to be lipid food reserve. Eyespots and pyrenoids are absent.
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Peter Heywood (1977) studied this question.
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