Abstract
Synchronized cultures ofScenedesmus obtusiusculus Chod. grown in media with and without calcium supply have been studied in the electron microscope. There is a cyclic variation in the stacking of thylakoids in cells grown in the presence of calcium. The degree of thylakoid aggregation and the frequency of single thylakoids increase during the dark period of the cell cycle. In calcium deficient cells a cyclic variation is also present, but the degree of thylakoid stacking and the frequencies of cells with granum-like aggregates and single thylakoids are higher than in the + Ca-cells.
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