Plantae
These organisms are eukaryotic, unicellular, and multicellular. Most members of this kingdom are phototrophic while few are heterotrophic. These organisms are responsible for many of the advancements of life due to their primary production capabilities.
Chlorophyta
Chlorophyta is a division of green algae, many of which are unicellular and multicellular. These organisms make up a large deal of oceanic seaweeds. This group is especially important in providing camouflage and homes to many other organisms in symbiotic relationships.
Phaeophyta
The Phaeophyta are commonly known as brown algae. They play an important role in marine environments, both as food and for the habitats they form. Most brown algae contain the pigment fucoxanthin, which is responsibly for their brown-green hue. Brown algae are unique heterokonts, as they are multicellular, unlike similar, unicellular heterokonts.
Rhodophyta
Most Rhodophyta are multicellular organisms, although a few are unicellular or colonial. Rhodophyta are pigmented with phycoerythrin, phycocyanin and allophycocyanins. These pigments are found in phycobilisomes. Rhydophyta do not have any flagella or centrioles. Nor do they have chloroplast endoplasmic reticulum. Rhodophyta have unstacked thylakoids in plastids.
Tracheophyta
Tracheophyta are land plants that have lignified tissues for conducting water and minerals throughout the plant. They also have a specialized non-lignified tissue (the phloem) to conduct products of photosynthesis. These plants sprout submerged and often emerge from the water once fully grown. Such species include the mangrove.