Why are mushrooms allocated to an independent kingdom?

More recently, mushrooms were attributed to plants, but now this very peculiar and large number of species group of living creatures is singled out in a separate kingdom. Mushrooms, like animals, are heterotrophs, feed on prepared organic compounds. They can be saprotrophs, i.e. feed on the organics of dead creatures, parasites, that is, feed on living organics, or symbionts of higher plants, being in mutually beneficial relationship with them. Mushroom cells do not contain plastid and chlorophyll. Among the fungi there are also “predators”, forming sticky loops in the soil, in which small roundworms get tangled. After this, the cells of the mycelium penetrate the captured worm, grow in it and suck out its contents. Fungal cells, like plants, have a cell wall on top of the plasma membrane. Often, the cell wall of fungi includes chitin, a substance that forms the outer integument of arthropods. A stored nutrient in fungal cells is glycogen carbohydrate, as in animals, and not starch, as in plants. The body of the fungus is formed by filamentary structures in one row of cells – hyphae. In some fungi, the partitions between cells are lost, and a mycelium appears, consisting of one giant multinucleated cell. Mushrooms are not capable of active movement, but they can grow unlimitedly – these are signs that combine mushrooms with plants. The methods for propagating fungi are diverse. They can reproduce asexually (parts of the mycelium, spores), as well as sexually.
Thus, the selection of mushrooms in an independent kingdom, numbering more than 100 thousand species, is absolutely justified.