The Moss <i>P. patens</i> (IMAGE) Washington University in St. Louis Caption Twenty-eight-day-old Physcomitrella gametophyte showing the leafy gametophores in the center and the protonemal filaments radiating outward. Credit Courtesy of Ralph Quatrano/WUSTL 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.