Microstegium (IMAGE) USDA Forest Service ‑ Southern Research Station Caption Microstegium can form dense organic mats in the forest understory. Credit Chris Oswalt, US Forest Service 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.