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Haematococcus
Two individuals of an unidentified Haematococcus species
Scientific classification
Clade:	Viridiplantae
Division:	Chlorophyta
Class:	Chlorophyceae
Order:	Chlamydomonadales
Family:	Haematococcaceae
Genus:	Haematococcus Wille in Warming, 1884
Species
Haematococcus capensis Haematococcus carocellus Haematococcus droebakensis Haematococcus lacustris Haematococcus murorum Haematococcus pluvialis Haematococcus thermalis Haematococcus zimbabwiensis

Haematococcus is a genus of algae in the family Haematococcaceae. Members of this group are a common cause of the pink color found in birdbaths. One of the most notable species of Haematococcus is H. pluvialis, which is used in cosmetic products due to its production of astaxanthin, a powerful antioxidant carotenoid, under stress conditions.

• Drawing of Haematococcus pluvialis
• Flagellate stage
• When stressed, this green microalgae, Haematococcus pluvialis, degrades chlorophylls and accumulates a strong red antioxidant, the carotenoid astaxanthin

References

1. See the NCBI webpage on Haematococcus. Data extracted from the "NCBI taxonomy resources". National Center for Biotechnology Information. Retrieved 2007-03-19.
2. Frank Shipley Collins. The Green Algae of North America, Volume II of Tufts College Studies, Published by Tufts College, 1909, pp 79-480. From Plate II.

Further reading

• Nozaki H, Onishi K, Morita E (2002). "Differences in pyrenoid morphology are correlated with differences in the rbcL genes of members of the Chloromonas lineage (Volvocales, Chlorophyceae)". J Mol Evol. 55 (4): 414–430. doi:10.1007/s00239-002-2338-9. PMID 12355262.
• Gutman, J., Zarka, A and Boussiba, S. 2009. The host-range of Paraphysoderma sedebokerensis, a chytrid that infects Haematococcus pluvialis. Eur. J. Phycol. 44: 509 - 514.

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