Amorphonostoc is a genus of cyanobacteria belonging to the family Nostocaceae.

The genus was first described by Alexander Elenkin in 1937.

Species: Amorphonostoc paludosum (Kützing ex Bornet & Flahault) Elenkin Amorphonostoc punctiforme (Hariot) Elenkin Amorphonostoc punctiforme (Kützing) Elenkin

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