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Phylum: Cyanobacteria   Family: Nostocaceae

Nostoc sphaericum  Vaucher ex Bornet & Flahault, 1886

Very similar to Nostoc commune but with slightly smaller cells and heterocysts. Habitat is also similar but tolerates standing water

Determiner: 
Chris Johnson

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

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