Definition of brown algae in US English:

brown algae

plural noun

  • Algae belonging to a large group that includes many seaweeds, typically olive brown or greenish in color. They contain xanthophyll in addition to chlorophyll.

    Class Phaeophyceae, phylum Heterokonta, kingdom Protista; formerly division Phaeophyta

    • ‘When presented with five macroalgal species concurrently, H. sanguineus preferred green algae to red and brown algae.’
    • ‘First, although the ‘algae’ are not monophyletic, the red algae, brown algae, etc., are monophyletic groups.’
    • ‘Some are featureless and probably represent bacterial mats, but a few have a stalk and seem to represent some sort of seaweed-like algae, possibly brown algae (phaeophytes).’
    • ‘Ribbed mussels, green algae (Enteromorpha spp.) and species of brown algae (Ascophyllum and Fucus) are often seen at the base of the mats of Spartina.’
    • ‘The largest of the chromists are the Phaeophyta, the brown algae - the largest brown algae may reach over 30 meters in length.’