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Phylum: Cyanobacteria   Family: Rivulariaceae

Rivularia atra  Roth ex Bornet & Flahault, 1886

A relatively common brackish water species, found in the upper tidal zone

Determiner: 
Chris Johnson

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

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