Phreatic Overgrowth (IMAGE) University of New Mexico Caption A closeup of the bulbous stalactitic feature of a phreatic overgrowth on speleothems (POS). Credit University of New Mexico 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.