Threatened species of Phaeophycota
Threatened species of brown algae
Endangered species of kelp
The Phaeophyta are almost entirely marine, frequently dominating rocky shores in cold and temperate waters throughout the world; a few species are found in in soil and freshwaters. The taxonomy is unclear with different treatments according to author. Some place the Phaeophyta in the Heterokontophyta, and other in the larger grouping of Phytophyta (algae).