The algae plants in fresh water include cyanobacteria, dinoflagellate, Chlorella, Macroalgae, Charophyta, Kelp, Porphyra, Spirogyra, Chlamydomonas, Chromococcus, Crescent, Spirogyra and so on. There are about 30,000 species of algae, mainly distributed in fresh water or seawater, which are divided into freshwater algae and seaweed, including Cyanophyta, Euglenophyta, Dinophyta, Chrysophyta, Xanthophyta, Bacillariophyta, Chlorophyta, Rhodophyta and Phaeophyta.

Brief introduction of algae

Algae is a primitive and ancient lower organism. Algae have simple structure, no differentiation of roots, stems and leaves, and most of them are single cells, colonies or multicellular phyllodes. For example, Chlorella is a single cell, Volvariella volvacea belongs to a group, and kelp is a thallus. Algae contain photosynthetic pigments such as chlorophyll, which can carry out photosynthesis and belong to autotrophs.

distribution range

Algae are widely distributed, have relaxed requirements on environmental conditions and strong adaptability, and can survive at extremely low nutrient concentration, extremely weak light intensity and quite low temperature. It can grow not only in rivers, streams, lakes and oceans, but also in short-term stagnant water or wet places. From the tropics to the poles, from snow-capped mountains to hot springs, from wet ground to not very deep soil, algae are almost everywhere. All algae except Charophyta have marine species.