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Phylum: Cyanobacteria   Family: Microcystaceae

Gloeocapsa atrata  Kützing, 1843

Colonies variable in size depending on age and, maybe, habitat. Widespread on various substrates and not necessarily acidic

Determiner: 
Chris Johnson

References: 
John, Whitton & Brook (2011) - The Freshwater Algal Flora of the British Isles

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