| Pediastrum | 
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| Pediastrum duplex | 
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| Scientific classification | 
| Clade: | Viridiplantae | 
 
| Division: | Chlorophyta | 
 
| Class: | Chlorophyceae | 
 
| Order: | Sphaeropleales | 
 
| Family: | Hydrodictyaceae | 
 
| Genus: | Pediastrum Meyen, 1829
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| Type species | 
| Pediastrum duplex 
 Meyen | 
| Species | 
| Pediastrum angulatumPediastrum angulosumPediastrum aniaePediastrum argentinensePediastrum bareilliensePediastrum berolinensePediastrum bisnupurensePediastrum biwaePediastrum brauniiPediastrum compactumPediastrum compactumPediastrum contiguumPediastrum diffusumPediastrum duplexPediastrum ellipticumPediastrum inconspicuumPediastrum indicumPediastrum janaktalensePediastrum lehensePediastrum leonensisPediastrum longicornePediastrum magnumPediastrum marvillensePediastrum musteriiPediastrum obtusumPediastrum orbitalePediastrum ovatumPediastrum pallidumPediastrum patagonicumPediastrum quadricornutumPediastrum sarmaePediastrum schroeteriPediastrum sculptatumPediastrum spinosumPediastrum tayloriiPediastrum tetrapodumPediastrum tricuspidatumPediastrum tricycliumPediastrum triplexPediastrum wilsoniiPediastrum wintonense
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Pediastrum is a genus of green algae, in the family Hydrodictyaceae. It is a photoautotrophic, nonmotile coenobial green alga that inhabits freshwater environments. The name Pediastrum comes from the Greek root words pedion, meaning "plane", and astron, meaning "star", referring to its overall shape.