Tweet this page Like this page Email this page Share this page Home» Resources » Identification » Identification of algae » Freshwater algae » How to identify algae » Identification guide » Unicellular » Cell wall is smooth round featureless Cell wall is smooth, cell outline round to ellipsoidal, and featureless 3. Do the cells contain organelles? Cell lacking membrane-bound organelles; contents usually bright blue-green. Cyanothece Cells containing membrane-bound organelles, such as chloroplasts and nuclei.