nostoc

noun

Any of various freshwater nitrogen-fixing cyanobacteria of the genus Nostoc that form spherical colonies of filaments embedded in a gelatinous substance.

noun

A plant of the genus Nostoc.

noun

A genus of fresh-water algæ belonging to the Cryptophyceæ or Cyanophyceæ, the lowest group of algæ, and typical of the family Nostocaceæ and subclass Nostochineæ.

proper noun

A genus of algæ. The plants are composed of moniliform cells imbedded in a gelatinous substance.

noun

found in moist places as rounded jellylike colonies