Pleurotaenium Nägeli

Cells usually solitary but rarely joined end to end in fragile pseudo-filaments. Cells straight, mostly cylindrical, in the middle slightly constricted, often with one or more inflations above the isthmus, the sides above smooth, undulate or nodose slightly tapering to the apex. The apex is rounded-truncate and in some species ornamented with a circle of polar nodules. (Croasdale, H. & Flint, E. 1986. Flora of New Zealand Desmids I. - Wellington Gov. Print.)

a. Pleurotaenium ehrenbergii (Bréb.) De Bary
Dimensions: L. 300–500 µm, B. 15–20 µm. Coesel 1985, Lenzenweger 1996, Ruzicka 1977.

b. Pleurotaenium ehrenbergii Apex.
Apical ring of warts where 6–8 usually are visible in ± the same focus..

c. Pleurotaenium ehrenbergii
Undulated base.