Single-celled freshwater alga, Closterium

Single-celled freshwater alga, Closterium

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Caption: Light micrograph of the single-celled freshwater alga, Closterium sp. Also called a desmid. The cell is divided into two sections: visible here at the division point (centre) of the two green chloroplasts. Chloroplasts are the site of photo- synthesis within the cell. The cell wall has an inner cellulose layer and outer pectin layer. At each pole is a vacuole (appears opaque) containing crystals of gypsum. Many species of Closterium are planktonic, floating in the water column as green algae and part of the freshwater food chain. They are widespread but thrive best in soft water or peat bogs. Magnification: x320 at 6x4.5cm size.

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Keywords: alga, algae, algal, botany, closterium, closterium sp., desmid, freshwater algae, green, nature, plant, single cell, type

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