The Green Rock-Posy Lichen (image) Pensoft Publishers Caption The green rock-posy lichen (center right) occurs on all continents, except Australia. Traditionally, the fungal partner of this lichen was considered to be a single species, but recently genetic data revealed six distinct species sharing a similar appearance. Credit Dr. Steve Leavitt Usage Restrictions CC-BY 3.0 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.