AM Map (IMAGE) Stanford University Caption One of three maps showing the distribution of trees likely to associate with the three major types of symbiotic bacteria or fungi. Credit Brian Steidinger Usage Restrictions Image may only be used with appropriate caption or credit 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.