Spirogyra cells contain chloroplasts, a large vacuole, a cell nucleus, cytoplasmic strands holding the nucleus in place and two cell walls. They are simple plants, with no specialized cells for absorbing water, transporting nutrients or reproduction.Spirogyra are considered unicellular plants even though they typically are found in long, free-floating filaments. This is because although the cells group themselves together, there is no communication or transport between the cells, as there is in multicellular organisms such as trees or grasses. Each spirogyra cell is a unit unto itself.Spirogyra cells arrange themselves end to end, with filaments being only one cell thick. As in more complex plants, the outer cell wall is made of cellulose, giving the strands a tough outer covering; although, their thinness makes them rather delicate. The second inner wall is made of pectin, a fibrous organic molecule commonly found in fruit.
