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|Noun||1.||family Nostocaceae - blue-green algae|
bacteria family - a family of bacteria
class Cyanobacteria, class Cyanophyceae, Cyanophyceae - photosynthetic bacteria found in fresh and salt water, having chlorophyll a and phycobilins; once thought to be algae: blue-green algae
genus Nostoc - type genus of the family Nostocaceae: freshwater blue-green algae