Abstract
1. Synchronized cells of Chlorella fusca Shihira et Krauss were studied by means of the electron microscope in a developmental stage preceding cellular cleavage. 2. The cell wall consists of a thin but complex layer intensely staining with KMnO4 and a thicker inner layer which could only be contrasted by lead hydroxide. The inner layer contains a densely interwoven network of fibrils presumably consisting of cellulose. 3. The chloroplast shows some deep incisions so that it is divided into several patches. It is not known whether these form a coherent system or not. 4. There are no chloroplast lamellae (thylakoids) in the central body of the pyrenoid which is surrounded by several starch plates. 5. The elements of the endoplasmic reticulum are preferentially situated in the outer region of the cytoplasm between the chloroplast and the plasma membrane. They appear to be mostly flattened vesicles. 6. The mitochondria are also concentrated in the periphery of the cell. They are rodshaped, strongly bent in many directions and very poor in inner structures. 7. The dictyosomes are regularly lying between the pyrenoid and the nucleus, thus revealing a certain polarity of the cell.
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