Red Algae (IMAGE) Rutgers University Caption Cyanidiales species of red algae, which appear green in this photo because chlorophyll masks their red pigment, growing in a hot spring at Yellowstone National Park. Credit Debashish Bhattacharya/Rutgers University-New Brunswick Usage Restrictions None License Licensed 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.