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Kingdom: Bacteria
Phyllum: Cyanobacteria - blue-green algae Nostoc Terrestrial and aquatic, rare in marine habitats. Also occurs symbiotically within some plant tissues and in hornworts. The most frequent cyanobacterium lichen photobiont, e.g in Collema, Leptogium. Left: Nostoc among Leptogium pulvinatum. The microscope photograph shows nostic chains in Collema tenax. Lowest photograph shows free-living Nostoc commune |
