portrait

Description:

Cosmarium praegrande P. LUNDELL

 The cells are up to 1.7 times longer than wide. The cell halves are spherical. The central cuts are deep and narrowly rounded on the inside and extend strongly towards the outside. The cell wall is covered with conical verrucae. They are arrranged in transverse rows which are shifted against each other. Between the transverse rows there are fine pores. The vertex view is circular in shape.

  Length 95 - 100 µm, width 55 - 65 µm.
 Occurrence: Rare occurrence in Central Europe in fens and quaking bogs.