Lichens (IMAGE) Ural Federal University Caption Lichens are a symbiosis of a fungus, unicellular algae, and/or cyanobacteria. This sample was found at forest. Credit UrFU / Anna Babikova Usage Restrictions Photo may be freely used to illustrate this topic, but please credit the author of the image: UrFU / Anna Babikova License Original 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.