Phylum: Charophyta   Family: Closteriaceae

Closterium lineatum C.G. Ehrenberg ex J. Ralfs 1848

First described by Brébisson in Ralfs (1848: 173, pl. 30: 1) and illustrated by Jenner. This nominate variety is shorter and broader than the variety elongatum but would appear to be much scarer in the Outer Hebrides.
Cell dimensions: L: 330-650 µm; B: 22-35 µm; Ap: 6.5-8 µm; L/B: 15-22.
Found in Sphagnum bogs, lochans and disused peat-cuttings but scarce.

References: 
Brook, A.J. & Williamson, D.B. (2010). A Monograph on some British Desmids.
Coesel, P.F.M. & Meesters, K.J. (2023 second edition). Desmids of the Lowlands.
Ralfs, J. (1848). The British Desmidieae.