The physiological attributes of fungal hyphae (including the secretion of nutrient-mobilizing enzymes, and rapid and plastic growth) may offer the plant partner in ectomycorrhizal symbiosis access to transient nutrient patches not available to roots. Tibbett and Sanders (pp. 783-789) show that the ectomycorrhizal fungus Hebeloma syrjense is able rapidly to access discrete organic nutrient patches more effectively than can the root system alone, to the benefit of the plant.