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Hyalotheca minor Desmid Species Outer Hebrides

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Phylum: Charophyta   Family: Desmidiaceae

Hyalotheca minor (G.B. Delponte) P.F.M. Coesel & K.J. Meesters 2023

First described and illustrated by Delponte (1873: 50, pl. 1: 2, 5, 6, 8, 9) as Hyalotheca dissiliens var. minor from Lago di Candia, a small, shallow Italian alpine lake of glacial origin, near the town of Candia Canavese in the Piedmontese province of Turin. Very recently, Coesel & Meesters (2023: 258) raised it to species level. It's rarely recorded and possibly restricted to Arctic-alpine regions. West, West & Carter (1923: 232) only recorded it from Capel Curig, North Wales, another mountainous region.
Cell dimensions: L: 10-20 µm; B: 10-22 µm; L/B: 1.00-1.20. Zygospore: 20 x 30 µm.
Found in mesotrophic waters, which are slightly acidic, but rarely recorded.

References: 
Coesel, P.F.M. & Meesters, K.J. (2023 second edition) Desmids of the Lowlands.
Delponte, G.B. (1873-1877) Specimen Desmidiacearum subalpinarum.
West, W., West, G.S. & Carter, N. (1923) A Monograph of the British Desmidiaceae, Volume 5.

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