Phylum: Charophyta   Family: Closteriaceae

Closterium lineatum var. elongatum (Rosa) Croasdale 1955

First described by Rosa (1951, p. 200, pl. 6: 3) as a forma; raised to a variety by Croasdale (1955, p. 525, pl. 8: 11). Similar in all respect to the nominate variety but with narrower cells which are less than 20 µm. Even this parameter overlaps with the nominate making the position of this variety rather tenuous. Found in Sphagnum bogs, lochans and disused peat-cuttings. A scarce desmid but can be locally abundant.

References: 
Rosa, K. (1951) Algenflora von Südböhmen. I. Die Algen der Umgebung von Blatná.
Croasdale, H.T. (1955) Freshwater algae of Alaska. 1. Some desmids from the interior.
Brook, A.J. & Williamson, D.B. (2010) A Monograph on some British Desmids.
Coesel, P.F.M. & Meesters, K.J. (2007) Mesotaeniaceae and Desmidiaceae of the European Lowlands.