Contents

28 June 2013
Vol 340, Issue 6140

About The Cover

Cover image expansion

COVER False-colored laser confocalfluorescence photomicrograph of Microcoleus vaginatus PCC9802 (blue) and Microcoleu steenstrupii SON82 (red) (image width: 0.3 millimeters). These two cyanobacterial strains are representative of the most abundant microbes in soil crusts of the arid lands in the western United States. M. vaginatus favors cooler climates, whereas M. steenstrupii prefers warmer areas. See pages 1533 and 1574. Image: Estelle Couradeau and Ferran Garcia-Pichel/W. M. Keck Bioimaging Laboratory, Arizona State University