Is algae multicellular or unicellular?

Algae are diverse group of thalloid plants characterized by single celled reproductive organs. If reproductive organs are multicellular then all the cells are fertile (i.e. Ectocarpus). Algae are both unicellular and multicellular. read more

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Some unicellular species of green algae, many golden algae, euglenids, dinoflagellates, and other algae have become heterotrophs (also called colorless or apochlorotic algae), sometimes parasitic, relying entirely on external energy sources and have limited or no photosynthetic apparatus. read more

Algae are both unicellular and multicellular. Chlamydomonas, Chlorella, Trebauxia etc are the examples of unicellular algae while Spirogyra, Oedogonium, Coleochaete, Fritschiella, Ectocarpus, Batrachospermum etc are the examples of multicellular algae. read more