algae at spillway, pond dam, claypit park
This green algae was found in a sample of plant material taken from the middle of the Colorado River.
Photo: University of Wisconsin
The Charophyta are a division of green algae, that includes the closest relatives of the embryophyte plants. In some groups, such as conjugating green algae, flagellate cells do not occur. The latter group does engage in sexual reproduction, and motility does not involve flagella, since they are totally lacking. Flagellate cells in the form of sperm are found in stoneworts (Charales) and Coleochaetales.