Diagnostic features
Colonial chlorophyte with roundish cells arranged in spherical colonies. The arrangement of cells is regular rather than haphazard. Cells may have a slight conical bulge facing outward from the colony, and are joined by outgrowths of the cell walls. Each cell contains a cup-shaped parietal green chloroplast with a pyrenoid. Colonies are hollow in the centre but this may not be visible if the cells are tightly packed together.
![[Coelastrum] (sewage pond), X640. Photo: Manaaki Whenua Image](/assets/Tools-And-Resources/Identification/algae/coelastrum640__ScaleWidthWzEwMjRd.jpg)