Sample collection (IMAGE) University of Göttingen Caption Dr Tatyana Darienko, University of Göttingen, co-author on the study, collecting the green biofilms on the trees and rocks that are the natural habitat of the rare alga Chlorokybus. Credit Dr Tatyana Darienko Usage Restrictions No restrictions. License Public Domain 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.