Phylum: Charophyta   Family: Mesotaeniaceae

Netrium digitus (L.A. de Brébisson ex J. Ralfs) H. Itzigsohn & Rothe 1856

First described by Brébisson in Ralfs (1848: 50, pl. 25: 3), and illustrated by Jenner, as Penium digitus. It was later moved to its current genus by Itzigsohn & Rothe (1856: no. 508).
Cell dimensions: L: 167-365 µm; B: 68-88 µm, L/B: 2.5-4.1.
A widespread species of acidic conditions, such as peat bogs, moorland pools and notably associated with Sphagnum, where it is usually abundant.

References: 
Coesel, P.F.M. & Meesters, K.J. (2023 second edition). Desmids of the Lowlands.
Itzigsohn, H. & Rothe [in] Rabenhorst, L. (1856). Die Algen Sachsens. Exsiccata. Decades 1-100.
Ohtani, S. (1990). A Taxonomic Revision of the Genus Netrium (Zygnematales, Chlorophyceae).
Ralfs, J. (1848). The British Desmidieae.
Van Westen, M. (2024). Sieralgen in Drenthe.
West, W. & West, G.S. (1904). A Monograph of the British Desmidiaceae, Volume 1.