from The Century Dictionary and Cyclopedia
- A subclass or group of algæ, of the class Cyanophyceæ, including the families Nostocaceæ, Rivulariaceæ, Scytonemaceæ, and Oscillariaceæ, in which the individual consists of a cellular or pseudocellular filament, reproduced by motile hormogonia, and in some families forming heterocysts.
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