Student Tracing Roots (IMAGE) Penn State Caption Penn State undergraduate Katie Myers is tracing a slippery elm root (a species with thin absorptive roots) from the tree to be placed in a root bag to allow for root proliferation. Credit Penn State Usage Restrictions non commercial use only 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.