alga on rock (IMAGE) University of Göttingen Caption The rocks in La Campana National Park (Chile) are one of the few sites where the rare alga Chlorokybus has been isolated and collected. The green areas on the rocks show where algal biofilms have grown. This bio-film is not only pure Chlorokybus but a mixture of different algae and microorganisms. 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.