Kelp
Kelps are large brown algae seaweeds that make up the order Laminariales. There are about 30 different genera.
Heterokont
The heterokonts or stramenopiles (formally, Heterokonta or Stramenopiles) are a major line of eukaryotes currently containing more than 25,000 known species. Most are algae, ranging from the giant multicellular kelp to the unicellular diatoms, which are a primary component of plankton. Other notable members of the Stramenopiles include the (generally) parasitic oomycetes, including "Phytophthora" of Irish potato famine infamy and "Pythium" which causes seed rot and damping off.