Image © Alfred van Geest

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


Image © Alfred van Geest

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.

mage: Hanny Kooijman née Van Blokland © IBED

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