Detail of a Pteridosperm (IMAGE) University of Bristol Caption Detail of a pteridosperm, an extinct seed-producing fern-like plant. Width across image about six centimeters. Credit Dr. Howard Falcon-Lang 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.