Mycorrhiza is an international journal devoted to research into mycorrhizas - the widest symbioses in nature, involving plants and a range of soil fungi world-wide. The journal covers research into mycorrhizas, including molecular biology of the plants and fungi, fungal systematics, development and structure of mycorrhizas, and effects on plant physiology, productivity, reproduction and disease resistance. Coverage extends to interactions between mycorrhizal fungi and other soil organisms, and effects of mycorrhizas on plant biodiversity and ecosystem structure. Mycorrhiza presents original papers, short notes and review articles, along with commentaries and news items. It offers a platform for new concepts and discussions, and serves as the basis for a forum of mycorrhizologists from around the world. Managing Editors: Vivienne Gianinazzi-Pearson, Dijon, France, and Randy Molina, Gresham, Oregon, USA Mycorrhiza is the official organ of the International Mycorrhiza Society.