portrait

Description:

Cosmarium protractum (NÄG.) DE BARY var. procerum LENZENW.

 The cells are only little longer than wide. The cell halves form three lobes, the lateral lobes are unequally rounded off, whereby they appear gently rolling. The vertex lobes are slightly widened outwards, rounded off laterally and slightly concave in the center. The central cuts are deep and outward extended. At the basis of both cell halves there is a hump, which is covered with larger verrucae. The remaining cell wall is covered with smaller warts. The vertex view is oblong oval with one distinct surface bulg each at the sides.

  Length 95 - 100 µm, width 55 - 65 µm.
 Occurrence: New description, well-known only from Greenland so far.