See text Chlorolobion, sometimes spelled Chlorolobium, is a genus of algae belonging to the family Selenastraceae.

[2] The species of this genus are found in freshwater habitats in Europe and America.

They are either free-floating, or in the case of Chlorolobion obtusum, attached to the carapaces of freshwater crustaceans.

The single chloroplast is plate-like and wraps around the inside of the cell, and contains one (rarely two) pyrenoids.

[3] Unlike other genera in its family, Chlorolobion has pyrenoids that are surrounded by a starch sheath, making them visible in the light microscope.