Vesicular

Arbuscular Mycorrhizae Fungi (VAM) or Vesicular Mycorrhizae (VM): These are symbiotic fungi that live within a plant’s root system. The term “mycorrhiza” means fungus-root. Mycorrhizal fungi produce hyphae (small filament-like tubes) that grow within plant roots and extend out into the soil. Also, the fungi produce spores that function as dispersal mechanisms and long-term survival agents. The plant provides carbohydrates and other essential nutrients to the fungus that the fungus cannot produce, and the fungus provides immobile nutrients such as phosphorus, iron, zinc, and copper, and mobile nutrients such as nitrogen and calcium to the plant. [Source: USDA National Plant Materials Manual]