In this section
- Cells containing membrane-bound organelles
Young cells spherical, but large older cells may elongate and be slightly constricted in the centre. One or two chloroplasts present when small, but many disc-shaped chloroplasts when large. Each chloroplast is yellow-green rather than grass green and does not store starch (subtle differences with green algae) and has a small eyespot which may be difficult to see. Unicellular, but cells may group together in clumps.