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Phylum: Charophyta   Family: Characeae

Nitella opaca  (C. Agardh ex Bruzelius) C. Agardh, 1824

Dark Stonewort

A widespread species of lochs, channels and streams, often with a low alkalinity

Determiner: 
Chris Johnson

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

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