Moss and Lichen (IMAGE) University of Arizona Caption Cladonia, a lichen, grows in a white puff only a few inches above a carpet of a moss called Pleurozium. Like the iconic black spruce (Picea) of the boreal belt, they harbor diverse endophytic fungi that live symbiotically within their healthy tissues. Credit Betsy Arnold Usage Restrictions This visual may only be used for the purpose of posting and/or reporting of this news release. Credit information must be provided as indicated. 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.