Phylum: Charophyta   Family: Desmidiaceae

Cosmarium moniliforme var. panduriforme (A. Heimerl) W. Schmidle 1895

It differs from Cosmarium moniliforme var. limneticum West & West 1908 in its smaller size but they occupy similar habitats and have occasionally been found together.
Cell dimensions: L: 21.7-27.6 µm; B: 12.2-15.6 µm; Is: 7-9.5; L/B: 1.69-1.82.
In the Outer Hebrides it has been found in silty loch-margins, and boggy moorland pools in slightly acidic to slightly alkaline habitats. It is infrequently recorded.

References: 
Kouwets, F.A.C. (2025) European Flora of the Desmid Genus Cosmarium. Part 1: Text. Part 2: Plates.
West, W. & West, G.S (1908). A Monograph of the British Desmidiaceae, Volume 3