If you put it under the sun, mushrooms won't grow. Haha, the poster doesn't need to buy mushrooms anymore... However, this black mushroom is probably poisonous. Mushrooms are fungi and they easily grow in damp and warm conditions. It's likely that due to the recent heat, the mop was also quite wet and was placed in a dark, poorly ventilated area, so it grew mushrooms. Actually, there are quite a few cases of mops growing mushrooms, so the poster doesn't need to worry. Just be more careful next time. After using the mop, just wring out the water and place it in a ventilated area or under the sun to dry. There are mushroom spores in the air, and with the right temperature and humidity, mushrooms will grow. It's best not to eat them for safety reasons. This indicates that the air in your home is somewhat humid, so pay attention to ventilation; otherwise, it's not good for household appliances or people. There are mushroom spores in the air, and with the appropriate temperature and humidity, mushrooms will grow. It's still best not to eat them for safety reasons. This shows that the air in your home is somewhat humid, so pay attention to ventilation; otherwise, it's not good for household appliances or people. Are you really going to eat this? Don't you care about your life! I'm speechless~ So powerful~ How can you even ask if this is edible? I'm dizzy~~~ Regardless of what kind of mushroom it is, it's best not to eat it. I'm confused, your floor needs to be mopped, and your mop needs to be cleaned.