Nostoc pruniforme (Mare's eggs) are a species of cyanobacterium. These freshwater bacteria grow in colonies which take the form of dark green, gelatinous spheres with a smooth surface like a plum. It is common and widely distributed both geographically and ecologically in oligotrophic and mesotrophic freshwaters in temperate and sub-Arctic regions.
In temperate lakes, N. pruniforme appears to grow in diameter from ~0÷2 cm in late spring to 2âÂÂ3 cm in midsummer and it can rapidly die off, supposedly because of attacks by viruses or bacteria at high summer temperatures (K. Sand-Jensen, unpubl. data). In contrast, in a cold (4 ðC), nutrient-poor spring in Oregon, USA, N. pruniforme reached a handball size of 15âÂÂ17 cm in diameter and weighed 2.6 kg after sustained slow growth for 9âÂÂ14 years. Very large colonies are also found in cold transparent lakes in Greenland (K. Sand-Jensen, unpubl. data). In addition to their larger size and persistence, they differ from Danish temperate specimens by having a more solid surface and a denser gel.