Question

Which fungi is most dangerous?

Answer 1

Fungi or fungus is the member of eukaryotic microorganisms for example- yeasts, molds, mushrooms. Fungi are found in moist and shady places and grow usually on dead and decayed material. Fungi in plants and animals possess chitin in their cell wall. Fungi absorb molecules by secreting digestive enzymes into the food.

Complete answer:
Fungi are the major decomposers in the environment. Fungi are known to be the symbionts between the plants and animals, or between the other fungi and parasites. Fungi undergo roles in decomposing dead matter and also providing nutrients and exchange to the environment.
Also, fungi have enormous diversity and morphologies from unicellular to large mushrooms. Fungi contain a diversity of $2.2$ million to $3.8$ million species. Some fungi can be fatal to human beings. Fungi can be dangerous and lethal to people but they are rare and occur only in geographic regions like-south America.
Infections by fungi can harm the immune system of human beings, weaken it and also skin diseases can occur. The most dangerous fungus is Amanita phalloides also known as death cap. Usually they are found in the United Kingdom and North America. They are the causative organisms for about $90\%$ of the fatal poisonings.

Note:
The Amanita phalloides causes liver failure and digestive system upset. Every species of Amanita will affect the kidney and liver also, the central nervous system in the brain. The mushroom poisoning also known as toadstools is fatal to humans. Fungus is classified separately from the kingdom. They contain long filaments called hyphae.