portrait

Description:

Euastrum verrucosum EHRENB. var. groenlandicum (LARSEN) WILLI KRIEG

 So far only two quite inaccurate illustrations of this alga exist: The original illustration of LARSEN (1904) and an illustration of GROENBLAD (1952). The cell halves are rounded off trapezoidal, both the lateral lobes and the vertex lobe drawn weakly into the center turn into one another, separated only by a shallow emargination. At the ends of the lateral lobes there are several short pricks. The central cuts are far opened. The hump near the isthmus range of the cell halves are covered with large warts, the remaining cell wall with concentric rows of small warts.

  Length 100 - 105 µm, width 80 - 85 µm.
 Occurrence: So far only known from Greenland