what is nostoc
Nostoc is a genus of cyanobacteria found in a variety of environmental niches that forms colonies composed of filaments of moniliform cells in a gelatinous sheath.The name Nostoc was coined by Paracelsus. It derives from the ancient Greek word  nÏsos  (Î½ÏÏÎ¿Ï, disease or sickness) .ostoc is a member of the family Nostocaceae of the order Hormogonales. Species include: 1  N. azollae. 2  N. caeruleum. 3  N. carneum. 4  N. comminutum. 5  N. commune, Koxianmi (Chinese). 6  N. ellipsosporum. 7  N. flagelliforme.