Contents

21 May 2021
Vol 372, Issue 6544

About The Cover

Cover image expansion

COVER Confocal microscopy image of a symbiotic fungus (Rhizophagus irregularis) colonizing the tissues of the nonvascular plant Marchantia paleacea (plant cell walls, cyan; fungus, green; plant chloroplasts, red). Chloroplasts transfer atmospheric carbon, as lipids, from the plant to the fungus, thus feeding it. The fungus, in turn, provides nutrients and water to the plant. This symbiosis has supported terrestrial plants since they began colonizing dry land 450 million years ago. See pages 789 and 864.
Credit: Cécile Pouzet (FRAIB/CNRS)