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Phylum: Charophyta   Family: Desnidiaceae

Xanthidium robinsonianum  W. Archer

A rare species with most records from Shetland and Sutherland. Koos Meesters has pointed out that the facial ornamentation is critical in separating this species from Xanthidium variabile. However, a close examination of the dimensions (presented by the leading authorities) show X. robinsonainum to be slightly larger with little overlap. Also, the extremity of the sinus in X. variabile is wider

Determiner: 
Koos Meesters (first image)
Chris Johnson (others

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

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