Mare's eggs (nostoc pruniforme) are a species of cyanobacterium. It grows underwater in colonies which take the form of dark greenish-gray, gelatinous spheres. This organism is a cyanobacterium. Image File history File links Download high resolution version (1375x984, 192 KB) Description: Nostoc pruniforme - these jelly balls are special colonies of cyanobacteria in freshwater. ... Scientific classification redirects here. ... Phyla Actinobacteria Aquificae Chlamydiae Bacteroidetes/Chlorobi Chloroflexi Chrysiogenetes Cyanobacteria Deferribacteres Deinococcus-Thermus Dictyoglomi Fibrobacteres/Acidobacteria Firmicutes Fusobacteria Gemmatimonadetes Lentisphaerae Nitrospirae Planctomycetes Proteobacteria Spirochaetes Thermodesulfobacteria Thermomicrobia Thermotogae Verrucomicrobia Bacteria (singular: bacterium) are unicellular microorganisms. ... Orders The taxonomy is currently under revision. ... Genera Anabaena Anabaenopsis Aphanizomenon Aulosira Cylindrospermopsis Cylindrospermum Loefgrenia Nodularia Nostoc Wollea The Nostocaceae is a family of cyanobacteria that forms filament-shaped colonies enclosed in mucus or a gelatinous sheath. ... Species See text. ... Latin name redirects here. ... Orders The taxonomy is currently under revision. ...