Silver pileus (Deschampsia cespitosa) (IMAGE) Norwegian University of Science and Technology Caption Silver pileus (Deschampsia cespitosa) is one of the species that scientists are most concerned about. The problem is that new species can displace the old ones. Here from Pyramiden in Svalbard. Credit Photo: Kristine Bakke Westergaard, NTNU Usage Restrictions Use only in association with articles about this research and with proper credit. 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.