Serianthes root (IMAGE) University of Guam Caption Root nodules from Guam's Serianthes nelsonii legume tree within which bacteria convert atmospheric nitrogen into a fixed form that the tree can exploit. Credit University of Guam Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.