Description: The cells are almost two times longer than wide. The cell halves have three lobes, the lateral lobes are broad and shallowly undulated at the ends. The vertex lobes are widened at the ends and are surrounded with a collar of warts. In the center of each cell half and on both sides of them there are broad swellings. The central cuts open outwards in an acute-angle.

Dimension: Length 57–60 µm, width 33–35 µm.

Occurrence: Southern America (Anden up to altitude of 3000 m toTierra del Fuego), Africa (Natal, Sudan), also recorded for Europe. In shallow, moderate acidic waters of fens and bogs.

Left: Original graphic by Prof. Lenzenweger.
Right: Photomicrograph by Prof. Lenzenweger. For microphotography, the microscope illumination was adjusted in such a way that as many features as possible that are important for species identification are prominently displayed.

Copyright by Prof. Rupert Lenzenweger, Ried im Innkreis, Austria.