Phylum: Charophyta   Family: Mesotaeniaceae

Tortitaenia trabeculata (A. Braun) A.J. Brook 1998

First described by Braun in Rabenhorst (1856: 543). as Spirotaenia trabeculata. Later moved by Brook (1998: 146) to Tortitaenia. Cells are subcylindrical with the chloroplast ridges less strongly spiralled (not always easy to see).
Cell dimensions: L: 140-240 µm; B: 19-30 µm; L/B: 3-8.
A rare species found in moorland bogs and abandoned peat-cuttings.

References: 
Brook, A.J. (1998) Tortitaenia nom. nov. pro Polytaenia Brook, a name of a genus of saccoderm desmids.
Braun, A. in Rabenhorst, L. (1856) Die Algen Sachsens. Exsiccata.
Coesel, P.F.M. & Meesters, K.J. (2023 second edition) Desmids of the Lowlands.