Lamellae in cyanobacteria are called what?

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Lamellae are thylakoids. These internal membrane sheets in cyanobacteria house the photosynthetic machinery, including the photosystems and the electron transport chain, maximizing the surface area for light-dependent reactions. Because cyanobacteria are prokaryotes, they don’t have chloroplasts or mitochondria; those are organelles found in plant/algal cells and other eukaryotes. Ribosomes are the protein-synthesis machines, not membrane structures. So the lamellar membranes used for photosynthesis in cyanobacteria are best described as thylakoids.