Brown algae

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Brown algae
Temporal range: 150–0 Ma
Giant kelp (Macrocystis pyrifera)
Scientific classification
Domain: Eukaryota
Kingdom: Chromalveolata
Division: Heterokontophyta
Class: Phaeophyceae

see Classification.



Brown algae are a large group of algae. They are classified as heterokont protists because they are neither plant nor animal. All the brown algae are multicellular, composed of more than one cell. Most brown algae have fucoxanthin, a chemical that gives them a brown color.

There are 2000 species of brown algae. Most species live in the ocean. They are important as food and as homes for many animals and marine life. Some brown algae are gathered by humans for food. The giant kelp Macrocystis is a brown alga that forms underwater forests, and it may grow to 60 meters. The Sargasso Sea gets its name from the Sargassum seaweed that floats on the surface. Many brown algae grow on rocks at the seashore.

Classification[change | change source]

This is a list of the orders in the class Phaeophyceae:[2]

References[change | change source]

  1. Kjellman, F. R. (1891). "Phaeophyceae (Fucoideae)". In Engler, A.; Prantl, K. Die natürlichen Pflanzenfamilien. 1. Leipzig: Wilhelm Engelmann. pp. 176–192.
  2. Guiry, M. D.; Guiary, G. M. (2009). "AlgaeBase". National University of Ireland. Retrieved 2012-12-31.