'Fungi are integral to the planetary web. The lives of plants, animals, and people depend on fungi. They support all forms of life, all stages of the natural life cycle, and play important roles in health and disease.
The earth supports more than 1.5 million species of fungi, a family comprising yeasts, molds, and mushrooms. Yeasts are unicellular. Molds and mushrooms are multicellular. They form networks of threadlike membranes called mycelia, which can infest a rooting apple or infiltrate an entire field or forest floor.'
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