Southwest Missouri State University 901 S. National Ave. There are two classes in the Division Rhodophyta. Taxa in this class may be unicellular, filamentous, flat and membraneous or tubular.
Growth is intercalary and cell division occurs throughout the plant generally.
A very simple life history features carpogonia not housed in a carpogonial filament that characterize the members in the class Florideophyceae. There are no tetrasporangia and instead are replaced in some taxa by chochosporangia. There are several genera that are typical of this class. Especially interesting is Poryphridium , species of which can be found in freshwater, brackish, and marine habitats. Being one of the few freshwater forms it is often overlooked in floristic surveys.