This interesting site on "Green Algae" (a paraphyletic group excluding Plantae) is maintained by the University of California's Museum of Paleontology, and is a central resource for algal information with links to associated resources. Four sections make up the heart of the site: Fossil Record, Life History & Ecology, Systematics, and More on Morphology. Additionally, this well-designed site contains many links to illustrated definitions and additional facts.