Mushrooms and Fungi

Mushrooms belong to fungi, a kingdom separate from plants and animals. Fungal cells contain a nucleus, so fungi are eukaryotes.

Fungi do not make food through photosynthesis. They obtain organic nutrients from other sources.

Fungal cell walls contain chitin, a structural material also found in insect exoskeletons. Plant cell walls characteristically contain cellulose.

The fungal wall is not made of chitin alone. It also contains other substances, including additional complex carbohydrates.

A mushroom is a spore-producing fruiting body formed by certain fungi. Much of the fungus can remain hidden within soil, wood or another material.

Fungal structures

The familiar mushroom grows from a network rather than acting as the fungus's entire body. Its fruiting structure helps produce and release spores.

However, not every fungus forms mushrooms or a large mycelium. Yeasts commonly grow as single cells.

Many fungi release enzymes outside their cells and absorb the resulting smaller molecules. Enzymes are substances that speed up chemical reactions.

In decomposer fungi, this process breaks down dead organic material. Nutrients return to the surrounding environment and become available to other organisms.

Fungi also include parasites and partners in mutually beneficial relationships. Therefore, not every fungus is simply a decomposer of dead material.

In a mycorrhizal association, fungal hyphae help plant roots obtain water and minerals. The plant supplies carbon compounds made through photosynthesis.

Some mushrooms contain compounds studied for medical effects. Reishi and shiitake are examples examined in research on immune responses and cancer-related applications.

Lion's mane, Hericium erinaceus, has also been studied in small human trials involving cognitive function.

A bioactive compound affects a biological process. Such activity does not by itself prove that eating the mushroom treats a disease.

Laboratory results, clinical trials and established treatments provide different levels of evidence. The particular extract, dose, condition and study design matter.

Avoid translating “studied for medicinal effects” into “cures cancer” or “repairs nerves”. Evidence about one preparation cannot be transferred automatically to every supplement.

A psychoactive substance can change mental processes such as perception or mood. Some mushrooms contain psilocybin, which can produce psychedelic effects.

Researchers have studied psilocybin in clinical trials for conditions including depression. These studies use defined doses and controlled procedures, often with psychological support.

A supervised trial is different from eating an unidentified mushroom. Research findings do not establish that every mushroom preparation has the same effects or safety.

Some fungi infect insects, while some mushroom compounds have insecticidal effects. These are different mechanisms.

Beauveria bassiana is an insect-pathogenic fungus used in microbial pest-control products. Its spores can germinate on an insect and penetrate the outer covering. Infection can then kill the insect.

Beauveria is a fungal biopesticide example, not a typical cap-and-stalk mushroom. Contact does not mean instant death.

Mushroom-derived compounds also provide direct examples. Experiments with Clitocybe nebularis compounds found harmful effects on Colorado potato beetle larvae.

One studied compound, clitocypin, interferes with digestive enzymes. These laboratory findings do not make every mushroom extract a ready-to-use pesticide.

A chemical source of light

Bioluminescence is light produced by a chemical reaction inside a living organism. In glowing fungi, the reaction involves a light-producing molecule called luciferin.

An enzyme called luciferase helps catalyse the reaction. Oxygen participates, and the reaction releases visible light.

Examples occur in Omphalotus, Mycena and Panellus. Glowing fungal tissue often emits green light, but the luminous part varies between species.

Do not assume every mushroom glows or that every glowing species lights up in the same place.

Insect attraction is one proposed benefit of fungal light. A 2015 experiment tested green-lit artificial mushrooms against unlit controls.

The illuminated models attracted more insects. This supports the idea that light can attract potential spore carriers.

The experiment did not prove that every luminous fungus gains the same benefit. Attraction and successful spore dispersal are related but separate claims.

Roridomyces phyllostachydis was described from Meghalaya in 2020. The fungus was collected from dead bamboo stems.

The recorded collection sites include the East Khasi Hills and West Jaintia Hills. The Mawlynnong locality links this example to northeastern India.

The named species and dated description are more useful than an undated statement about a recent discovery.

Mushroom species and their compounds show medicinal potential, psychoactive effects, insecticidal effects and bioluminescence. These properties occur across different examples.

The four properties do not have to occur together in one mushroom. Use a separate, suitable example for each property.

Read the UPSC 2023 mushroom-properties question.