Fungus

Fungi are a group of living things.

They include mushrooms and mold. They are not plants. Fungi cannot make food from sunlight. Instead, they soak up food from their world.

Many fungi live in the soil. They help clean up dead things. This helps the Earth stay healthy. Some fungi can even glow in the dark!

They are all around us.

Fungi are a group of living things.

This group includes mushrooms, yeast, and mold. Many people think fungi are plants. But they are actually more like animals.

Plants make food from sunlight. Fungi cannot do this. Instead, they get food by soaking up tiny bits of organic matter. They do this by letting out special enzymes. These enzymes help break down food in their environment.

Most fungi are very small. They often live in soil or on dead things. They use these parts called hyphae to grow. Hyphae are long, thin threads.

These threads help them spread out. Fungi are great decomposers. This means they break down dead matter. This helps move nutrients through nature.

Many plants need fungi to live. Over 90% of plants work with fungi. This is called mycorrhizal symbiosis. It helps plants grow better. Fungi also help humans in many ways. We use them to make bread and cheese.

Some fungi even help make medicine. We call the study of fungi mycology.

Fungi are a unique group of living things.

This group includes mushrooms, molds, and yeasts. For a long time, people thought they were plants. However, we now know they are actually more like animals.

They do not use sunlight to make food. Instead, they are heterotrophs, which means they get energy by absorbing nutrients. They do this by releasing digestive enzymes into their surroundings. These enzymes break down organic matter so the fungus can soak it up.

Most fungi grow in a very special way.

Instead of moving around, they grow through their bodies. Many fungi are made of tiny, thread-like structures called hyphae. These threads grow from their tips to spread out through the soil or wood. Some fungi are just single cells, like yeast. Others can grow into huge structures like mushrooms. Fungi have a special cell wall made of chitin. This is the same material found in the hard shells of insects. This makes them very different from plants, which use cellulose instead.

Scientists have studied these organisms for a very long time.

In the 18th and 19th centuries, thinkers like Carl Linnaeus and Elias Magnus Fries worked to classify them. They used the shape of spores to group them. Today, we use mycology, which is the scientific study of fungi.

Mycology was once seen as a part of botany. Now, we use DNA analysis to understand their true family tree. This modern way of looking at life shows how they are related to animals.

There is an enormous amount of fungal life on Earth.

Experts estimate there are between 2.2 million and 3.8 million species. However, we have only described about 148,000 of them so far. This means most fungi are still a mystery to us.

Fungi are found everywhere, from hot deserts to the deep sea. Some can even survive the harsh radiation of space. We find them in the soil, in water, and even on living animals.

Fungi are very important to our daily lives.

They help recycle nutrients in nature by breaking down dead things. Over 90% of plants rely on a partnership with fungi to grow. Humans also use them for food, like mushrooms and truffles. We use yeast to make bread rise and to make beer. Since the 1940s, we have even used fungi to make antibiotics. These medicines help fight off many types of sickness.

Fungi belong to a unique biological kingdom known as Fungi.

This group includes diverse organisms like microscopic yeasts, fuzzy molds, and large mushrooms. Fungi are eukaryotic organisms, meaning their cells contain a membrane-bound nucleus. While they might look like plants, they are biologically very different. In fact, fungi are genetically more closely related to animals than to plants. This distinction is important because fungi do not perform photosynthesis. Instead, they are heterotrophs, which means they must consume organic molecules for energy.

To get nutrients, fungi use a fascinating process of external digestion. They secrete digestive enzymes directly into their surrounding environment. These enzymes break down complex organic matter into smaller, dissolved molecules. Once the matter is broken down, the fungus absorbs these nutrients through its cell walls. Unlike plants, which use cellulose for structure, fungal cell walls contain a chitin-glucan complex. Chitin is a tough material also found in the exoskeletons of insects.

This unique chemical makeup helps define the kingdom. Most fungi grow through their bodies rather than moving from place to place. This growth occurs through thread-like structures called hyphae. These hyphae extend from their tips using specialized clusters of vesicles called the Spitzenkörper. Some fungi, like yeasts, remain unicellular and do not form these long threads.

Fungi exhibit incredible diversity in their physical forms and life strategies. They can be single-celled, like the yeast *Saccharomyces cerevisiae*, or multicellular and massive. Some species are dimorphic, meaning they can switch between a yeast phase and a hyphal phase. Others form complex fruiting bodies, such as the mushrooms we see in forests. There are also specialized structures like rhizomorphs, which act like roots to transport water and nutrients.

These structures allow certain fungi to spread across large areas of soil or wood. Even in extreme environments, fungi find ways to survive. They inhabit everything from deep-sea sediments to high-salt areas and deserts. Some can even endure the intense radiation found in space.

The study of fungi is a scientific field called mycology.

In the past, mycology was considered a branch of botany, or plant science. This was because fungi are mostly immobile and grow in soil like plants. Early taxonomists like Carl Linnaeus, Christiaan Hendrik Persoon, and Elias Magnus Fries classified fungi by their morphology. They looked at physical traits like spore color or microscopic shapes. However, modern science has changed our understanding through molecular phylogenetics. This is the study of evolutionary relationships using DNA analysis. Recent studies in the early 21st century have reshaped the fungal tree of life. The kingdom is now divided into one subkingdom, seven phyla, and ten subphyla.

Fungi play a fundamental role in the health of our planet. They are the principal decomposers in most ecological systems. By breaking down dead organic matter, they drive essential nutrient cycling. One of their most important roles is through mycorrhizal symbiosis. Over 90% of all plants depend on a partnership with fungi to grow. This relationship helps plants take up nutrients and increases their ability to perform photosynthesis. This process also helps increase carbon uptake from the atmosphere, which can help stop climate change.

Without fungi, the exchange of nutrients in the environment would be much less efficient.

Humans interact with fungi in many surprising ways. We use them directly as food, such as truffles and various mushrooms.

Fungi are also essential in food production through fermentation. Yeast is used as a leavening agent to make bread rise. Fungi are also used to produce wine, beer, and soy sauce. Since the 1940s, we have used fungi to create antibiotics to fight infections. Beyond food and medicine, fungi are used in industry to create enzymes for detergents. They can even act as biological pesticides to control weeds and insect pests.

However, fungi can also cause significant problems. Some species produce mycotoxins, such as alkaloids and polyketides, which are toxic to humans and animals.

Fungi can also be pathogens that cause diseases in crops, such as rice blast disease. These diseases can damage food supplies and local economies. Some fungi can even break down manufactured buildings or become dangerous to humans. Despite their importance, the fungal kingdom is under threat. Pollution, deforestation, and the use of pesticides and fungicides can harm these organisms. We are still discovering much about them, as only about 148,000 of the estimated 2.2 to 3.8 million species have been described.