Annamia toxica, a species from freshwater in the Hue area in Vietnam, has been found to produce at least two different microcystins (Nguyen et al. 2007)
Nguyen, L.T.T., Cronberg, G., Annadotter, H. & larsen, J. (2007). Planktic cyanobacteria from freshwater localities in Thuathien-Hue Province, Vietnam. II. Algal biomass and microcystin production. <em>Nova Hedwigia 85: 35-49.</em>