Euastrum gayanum. Notice about trapeziform semicells with deeply concave lateral sides and wide, V-shaped apical indentation.

Cell dimensions (L x B): 14 x 13 µm

Empty cell of Euastrum gayanum showing cell wall sculpturing in the form of a central inflation and some scattered granules near the margins.

 

 

Denmid of the month
February 2019

Euastrum gayanum

Eu. gayanum is a very small-sized, but nevertheless rather characteristic Euastrum species. Cells are but a little bit longer than broad and semicells are about trapeziform with deeply concave lateral sides between the truncate basal lobes and the somewhat dilating apical lobes. Apices with a broad, median V-shaped indentation. Semicells are provided with a flattened central inflation and some scattered marginal and inframarginal granules. In the Netherlands, Eu. gayanum is widely distributed and of occasional occurrence in slightly acidic, mesotrophic water bodies.

SEM picture of Euastrum gayanum showing cell wall sculpturing in more detail.