Oxygen is not produced during photosynthesis by

Green sulfur bacteria are nonmotile and capable of anoxygenic photosynthesis. In contrast to plants, green sulfur bacteria mainly use sulfide ions as electron donors.

Cycas belongs to Gymnospermaea, which show oxygenic photosynthesis. Chara is a Chlorophyceae member to show oxygenic photosynthesis. Cyanobacteria like Nostoc, Anabaena have evoleved oxygenic photosynthetic mechanism.