1) Bacteria family 2) Blue-green algae 3) Family nostocaceae 
The Nostocaceae is a family of cyanobacteria that forms filament-shaped colonies enclosed in mucus or a gelatinous sheath. Some genera in this family are found primarily in fresh water (such as Nostoc), while others are found primarily in salt water (such as Nodularia). Other genera (e.g. Anabaena) may be found in both fresh and salt water. Like o...
[n] - blue-green algae
family Nostocaceae noun blue-green algae