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SUMMARY: Vegetative organisms of Azotobacter chroococcum, as seen by electron microscopy of ultra-thin sections, had a single, very thin wall, surrounded by a capsule which appears to correspond structurally to an outer wall. The smaller gonidial forms had double walls and no capsule. Cysts had a spore-like multiple wall, and give evidence of being produced within the cell.

Ultrastructure of Cell Envelopes of Large Cells, Small Cells and Cysts of Azotobacter chroococcum