Phylum: Charophyta   Family: Desmidiaceae

Staurastrum inflexum L.A. de Brébisson 1856

Cells slightly broader than long to about as broad as long. A wide-open sinus with a V-shaped apex. Semicell subcuneate with a convex apex. Processes convergent with a series of medium-sized concentric granules tipped with four small to medium-sized spines. Cells usually tri-radiate but occasionally quadri-radiate. It needs to be compared closely with similar species such as St. subnivale.
Cell dimensions: L: 25-29 µm; B: 27-37 µm; Is: 6.9-9.2 µm; L/B: 0.74-0.99.
This species prefers neutral to slightly alkaline habitats such as ephemeral pools but is occasionally found in slightly acidic conditions.

References: 
Coesel, P.F.M. & Meesters, K.J. (2023 second edition). Desmids of the Lowlands.
Van Westen, M.C. (2024).Sieralgen in Drenthe.