Lee Kong Chian Natural History Museum

Pediastrum sp. Meyen, 1829

Kingdom:Plantae
Phylum/Division:Chlorophyta
Class:Chlorophyceae
Order:Chlorococcales
Family:Hydrodictyaceae
Genus:Pediastrum

Description

This is a colonial alga with 2-128 polygonal cells arranged in a stellate plate of a cell thick. The coenobium may be entire or perforate, and if of more than 16 cells, the cells can be in concentric rings. The peripheral cells are usually of a different shape from those of the interior, mostly with 1-3 processes. Young cells have a single parietal discoid chloroplast with a pyrenoid while in old cells the chloroplast is diffused and contain more than one pyrenoid. 

Read more about the Chlorococcales order.
Read more about the Hydrodictyaceae family.

Locality Map

General Biology

Pediastrum is often found in pools of water together with other algae.

Life Cycle

Every cell in the colony is capable of giving rise to biflagellate zoospores that when released form separate colonies. Sexual reproduction is isogamous. The biflagellate gametes formed by any individual cell fuse to form zygotes that in turn release biflagellate zoospores. These zoospores eventually develop into individual colonies.

References

Bold, H. C., C. J. Alexopoulos & T. Delevoryas, 1987. Morphology of plants and fungi. Harper & Row, New York. (5th ed.). 912pp.

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