siphonaceous

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siphonaceous (siphoneous) Applied to algae in which the thallus is not divided up by septa, i.e. the many nuclei are not compartmentalized into cells. The typical siphónaceous alga has a large central vacuole surrounded by a layer of protoplasm, containing nuclei and chloroplasts, which lines the cell wall.

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siphonaceous (siphonous) Describing algae and other protoctists in which the thallus is coenocytic (see coenocyte) and often takes the form of a tubular structure.