Culture Collection of Algae of Göttingen University (SAG) The Culture Collection of Algae at the Georg August University Göttingen is one of the five largest collections of living microscopic algae. Founded in 1954, the SAG collection today holds around 2.250 strains from almost all evolutionary lineages of algae and cyanobacteria (1202 named species from 521 genera), mostly isolated from freshwater or terrestrial habitats.