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Anabaena (cyanobacteria)
Anabaena, a filamentous cyanobacteria (after Margulis & Schwartz 1988, p.49)
Anabaena, a filamentous cyanobacteria which performs photosynthesis, grows in freshwater lakes and ponds. Its cells divide by forming crosswalls within an outer sheath. The joined cells form a filament-like colony. Photosynthetic membranes called thylakoids line the inner cell walls. These are filled with chlorophyll pigments which absorb sunlight.
Floating within each individual cell are organelles called carboxysomes. These function as microcontainers of Rubisco, a crucial enzyme in photosynthesis.
Reference:
Margulis and Schwartz 1988
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