Get a better picture of that shroom if you can I think I recognise it.
I've heard you can use dilluted hydrogen peroxide to get rid of fungai.

c/p
"Helps Plants
It is this hydrogen peroxide in rainwater that makes it so much more effective than tap water when given to plants. With the increased levels of atmospheric pollution, however, greater amounts of H202 react with air-borne toxins and never reach the ground. To compensate for this, many farmers have been increasing crop yields by spraying them with diluted hydrogen peroxide (5 to 16 ounces of 35% mixed with 20 gallons of water per acre). You can achieve the same beneficial effect with your house plants by adding 1 ounce of 3% hydrogen peroxide (or 16 drops of 35% solution) to every quart of water you give your plants. (It can also be made into an excellent safe insecticide. Simply spray your plants with 8 ounces of 3% peroxide mixed with 8 ounces of white sugar and one gallon of water.)"
killerweed420 Reviewed by killerweed420 on . unwanted mushrooms in the weed pots This has never happened to me before and I don't really know if it's a problem. After a certain mother has been growing for at least a year in a closet, shrooms started appearing. Is this bad? Is it an emergency? Do I need to transplant or flush like crazy, or can I just pick them out as they appear? How in the world do they show up a year after planting when they are in a closet? The only thing I can think of is I somehow carried some spores into the closet, but that doesn't make sense because Rating: 5