Phylum: Charophyta   Family: Desmidiaceae

Cosmarium bipyrenoideum P.F.M. Coesel & K.J. Meesters 2015

First described in 2015 from a shallow pool in ‘Kuinderbos’ near Kuinre, The Netherlands. The specific epithet describes it well as few cells of this size have two pyrenoids per semicell.
Cell dimensions (2): L: 37-42.6 µm, B: 32.3-33 µm, Is: 10.8-13.3 µm; L/B:1.13-1.32. (Note: one cell is distorted probably giving misleading dimensions).
The current finds are from very different habitats, but both are mesotrophic and slightly alkaline.

References: 
Coesel, P.F.M. & Meesters, K.J. (2023 second edition). Desmids of the Lowlands.
Kouwets, F.A.C. (2025). European Flora of the Desmid Genus Cosmarium. Part 1: Text. Part 2: Plates.