“We estimated these large clones to be hundreds to thousands of years old”, says the study”
“Implications of Extreme Life Span in Clonal Organisms: Millenary Clones in Meadows of the Threatened Seagrass Posidonia oceanica,” Sophie Arnaud-Haond [pictured here], Carlos Duarte, Elena Diaz-Almela, Nuria Marbà, Tomas Sintes, et al. (2012) PLoS ONE 7(2): e30454.
(Thanks to investigator Mike Livstone for bringing this to our attention.)