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Caption: False-colour scanning electron micrograph (SEM) of the colonial diatom Fragillaria crotonensis. Some diatoms, such as this one, form very simple colonies consisting of cells which have failed to separate following cell division. The micrograph shows 14 such cells of F. crotonensis, each glued at its centre to its neighbours by a mucilaginous material. The species lives in freshwater lakes. Diatoms are a group of single-celled algae distinguished by their glassy, silica-based cell wall or "frustule". They are an important component of the marine & freshwater plankton. (Magnification unknown). Yellow tint. Ref.: MICROCOSMOS, figure 5.27, page 103.

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Keywords: alga, algae, algal, botany, colonial, diatom, diatoms, fragillaria crotonensis, nature, phytoplankton, plankton, plant, scanning electron micrograph, sem

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