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- Cells contain membrane-bound organelles (chloroplasts, nuclei etc) and cell contents are grass green
- Colonies have regular structure
Coelastrum (Radiococcaceae)
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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.