Phylum: Charophyta   Family: Closteriaceae

Closterium dianae var. brevius (S. Petkoff) W. Krieger 1935

First described by Petkoff 1910: 97 & 160) as Closterium dianae f. brevior. It was later made a variety by Krieger (1935: 296, pl. 19: 13).
Cell dimensions: L: 156-164 µm; B: 19-20 µm; Ap: 2.8-3 µm; Arc: 92-148°; L/B: 8-9.
There are few records of this variety which is thought to be rare in Britain. An acidophile of moorland bogs and pools. It differs from the nominate in being shorter and broader, mainly due to its tumidity.

References: 
Brook, A.J. & Williamson, D.B. (2010). A Monograph on some British Desmids.
Krieger, W. (1935). Die Desmidiaceen Europas mit Berücksichtigung der aussereuropäischen Arten.
Petkoff, S. (1910). La flore aquatique et algologique de la Macédoine du S.-O.
Van Westen, M. (2024). Sieralgen in Drenthe.