Fungi are eukaryotic organisms in the kingdom Fungi. The group includes yeasts, moulds, mushrooms, rusts, smuts, truffles, mildews, and many microscopic species. Fungi are not plants, animals, or bacteria, although they interact closely with all three.
Most fungi absorb nutrients from their surroundings rather than making food through photosynthesis. They break down organic matter, form partnerships with plants and algae, provide food and medicines, and can also cause disease in plants, animals, and people.
Biology
Fungal cells have nuclei and other membrane-bound structures. Their cell walls usually contain chitin, which helps separate them from plants, whose cell walls are mainly cellulose.
Many fungi grow as hyphae, thin branching filaments that form a network called mycelium. The visible mushroom is only the fruiting body of some fungi. Much of the organism may be hidden in soil, wood, leaf litter, food, or living tissue.
Yeasts are single-celled fungi. Some fungi can switch between yeast-like and filamentous forms depending on conditions.
Reproduction
Fungi reproduce by spores and by vegetative growth. Spores may be produced sexually or asexually and can spread by air, water, animals, soil disturbance, or direct contact.
Fruiting bodies such as mushrooms, brackets, puffballs, and truffles are structures that help make or release spores. Many fungi never produce large visible fruiting bodies.
Ecological Roles
Fungi are major decomposers. They break down dead plants, wood, leaf litter, and animal remains, returning nutrients to soils and ecosystems.
Many plants depend on mycorrhizal fungi, which live in or around roots and help with water and nutrient uptake. In return, the plant supplies sugars made by photosynthesis. Lichens are partnerships between a fungus and a photosynthetic partner such as an alga or cyanobacterium.
Fungi also shape ecosystems as parasites and pathogens. Some control insect populations, some attack crops, and some drive disease in wild plants and animals.
Uses
Fungi are used in:
- Bread, beer, wine, and other fermented foods.
- Cheese ripening and flavour development.
- Edible mushrooms and truffles.
- Medicines, including antibiotics and immunosuppressants.
- Enzyme production, biotechnology, and research.
- Soil, composting, and some forms of bioremediation.
Their economic value comes from both direct products and the ecosystem services they provide.
Disease and Safety
Most fungi do not cause human disease. Common fungal problems include ringworm, nail infections, vaginal yeast infections, and some mould-related respiratory conditions. More serious fungal diseases can occur after inhalation of environmental spores, in hospital settings, or in people with weakened immune systems.
Some mushrooms are poisonous and can resemble edible species. Identification based on appearance alone can be unreliable, especially for non-specialists.
Conservation and Research
Fungi are less completely documented than plants and animals. Kew reports that a large share of fungal diversity remains unknown, and its Fungarium holds more than a million preserved specimens used for taxonomy, distribution records, plant-fungus studies, pathogen identification, and DNA research.
Fungal conservation matters because fungi support soils, forests, crops, nutrient cycling, and many food webs.
See Also
References
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