This article is about the algae pdf ebook download plant-like algae. Seaweed refers to several species of macroscopic, multicellular, marine algae. The term includes some types of red, brown, and green algae.
Seaweed” is a colloquial term and lacks a formal definition. A seaweed may belong to one of several groups of multicellular algae: the red algae, green algae, and brown algae.
As these three groups do not have a common multicellular ancestor, the seaweed are in a polyphyletic group. Seaweed’s appearance somewhat resembles non-arboreal terrestrial plants.