Fossil Fungal Mycelium (IMAGE) Frontiers Caption ESEM image of a fossil fungal mycelium with associated 'cauliflower-like' microstromatolite formed by iron-oxidizing bacteria. From Koko Seamount, Pacific Ocean. 43 Ma old. Credit Dr. Magnus Ivarsson 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.