Phylum: Charophyta   Family: Desmidiaceae

Micrasterias truncata var. bahusiensis V.B. Wittrock 1869

West & West (1905: 85) note: “Cells with large outstanding polar lobes; incisions below the polar lobes widely open.” The sinus is also gaping. Extremities of the lateral lobe are dentate.
Cell dimensions (2): L: 107-115 µm; B: 96-105 µm; Is: 23-25 µm; L/B: 1.12-1.10.
Found in acidic mesotrophic waters such as moorland pools and abandoned peat-cuttings. Rarely encountered.

References: 
Coesel, P.F.M. & Meesters, K.J. (2023 second edition). Desmids of the Lowlands.
West, W. & West, G.S. (1905). A Monograph of the British Desmidiaceae, Volume 2.