1. Heplontic type: The organelles of this type of algae are diploid and the zygote is diploid in nature. eg Ulothrix.
2. Deplontic type: Gametes of these algae are haploid and organelles are diploid in nature. For example- Sargassum.
3. Isomeric type: Haploid and diploid organelles exist in this type of algae. Like- Laminaria, Macrocystis, Nerocystis etc.
4. Hetaromorphic type: The gametophytic state of these algae is haploid and
The sporophytic state is diploid. For example – Urospor.
5. Heplobiontic type: Two haploid stages and one diploid stage exist in their life cycle. eg Coleochaete.
6. Deplobiontic type: There are two diploid stages and one haploid stage in their life cycle. Eg- Polysiphon.