Guyana trees (IMAGE) University of California - San Diego Caption Mora excelsa trees with giant buttresses form a prominent part of the pristine rainforest of Guyana. Credit Christopher Wills, UC San Diego Usage Restrictions Must be used in conjunction with PLOS Computational Biology paper on diversity and ecosystem health. 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.