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.