Description: The cells are appr. 1.4–1.6 times longer than wide and trapezoidal in shape. The cell sides are formed by flat depressions from two distinct waves.The vertex lobes are clearly separated, strongly broadened towards the ends. They have a central cut with a spine each on the sides. The central cut of the cell is narrow, the cell wall is covered with warts and denticles.

Dimension: Length (45)–58–75 µm, width (28)–42–52 µm.

Occurrence: Rather rare, most of the reported finds are in northern areas and higher altitudes. Sporadic in medium acidic waters of fens and moorlands.

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.