Alga is a term that describes a large and incredibly diverse group of eukaryotic, photosynthetic lifeforms. These organisms do not share a common ancestor and hence, are not related to each other (polyphyletic).
- Algae do have a cell wall which consists of cellulose, Galatians and mannans.
- Algae, including plants, contain cell walls that comprise either polysaccharides like cellulose or a range of glycoproteins or both.
- The presence of additional polysaccharides in algal cell walls is often used as a tool for algal taxonomy Mananas type microfibrils in the cell walls of a variety of marine green algae such as those in the genera Codium, Acetabularia and in the walls of certain red algae such as Porphyra.
- In bacteria, the cell wall is composed of peptidoglycan.