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
- 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).
- First, although the ‘algae’ are not monophyletic, the red algae, brown algae, etc., are monophyletic groups.
- The largest of the chromists are the Phaeophyta, the brown algae - the largest brown algae may reach over 30 meters in length.
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