The Macrophytes (aquatic plants or hydrophytes) although in this guide we have placed them inside the Algae, they are not really part of them, but they are plants that have adapted to live in very humid or aquatic environments. The reason for having included them in the Algae, is not other than the fact that colloquially they are called Algae.

Returning to the adaptation by Macrophytes to the aquatic environment, there are different degrees of such adaptation. We can find different groups of Macrophytes: those that are totally submerged (submerged Macrophytes), partially submerged (emerging Macrophytes) (these are the majority) or species that have floating leaves (floating Macrophytes).