1. Classifications
2. Green algae
   • Actinastrum
   • Bulbochaete
   • Cladophora
   • Coelastrum
   • Dictyosphaerium
   • Eudorina
   • Mougeotia
   • Oedogonium
   • Oocystis
   • Pandorina
   • Pediastrum
   • Planktosphaeria
   • Scenedesmus
   • Selenastrum
   • Sphaerocystis
   • Spirogyra
   • Stigeoclonium
   • Ulothrix
3. Coelastrum

Genus: Coelastrum

Green algae

Coelastrum is a green alga forms a multi-cellular colony with cells arranged in a hollow sphere without a gelatinous envelope.