Why have botanists for a long time believed that mushrooms are plants?

Mushrooms are a special kingdom of living nature. They combine the characteristics of animals and plants. For a long time, botanists have attributed mushrooms to plants, because they do not have active movements like animals. The absorption of nutrients in fungi occurs through absorption from the soil. Mushrooms reproduce by spores. They have a thick cell wall, just like plants. Mushrooms are able to synthesize some substances on their own.