Cycas micronesica root (IMAGE) University of Guam Caption Specialized coralloid root structures from Guam's Cycas micronesica cycad tree within which cyanobacteria 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.