James Owen in Stockholm, Sweden
for National Geographic News
April 14, 2008
The world's oldest known living tree, a conifer that first took root at the end of the last Ice Age, has been discovered in Sweden, researchers say.
The visible portion of the 13-foot-tall (4-meter-tall) "Christmas tree" isn't ancient, but its root system has been growing for 9,550 years, according to a team led by Leif Kullman, professor at Umeå University's department of ecology and environmental science in Sweden.
The research forms part of an ongoing study into how and when trees colonized Scandinavia after it had thawed.