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English: Fluorescent photomicrographs of a synchronous culture of Galdieria sulphuraria (strain 002) grown under optimal conditions (500 µmol photons m⁻² s⁻¹, 40 °C, pH 3). Daughter cells ((A) 0 h), growing single cells ((B) 8 h), chloroplast and nuclei starting to divide ((C) 12 h), division into 2 cells ((D) 14 h), division into 4 cells, protoplast division apparent ((E) 16 h), four daughter cells growing inside the original mother cell wall before their release ((F) 24 h). Nuclei in green were stained by SYBR Green I, chloroplasts in red—autofluorescence of chlorophyll. The bar represents 5 µm.