Shotgun fungus A little gem like fungus, which prefers to grow in mulch and tends to swell, has been termed as “Short gun Fungus”. This fungus can fly up to 8 feet in the air and will spatter your house with tiny brown specks and once they stick to your house or windows, they stick like glue. Most of us suspect the spiders and aliens for this tiny brown speck. You can’t prevent this fungus, but can do something by keeping the mulch loose so air can circulate inside to keep this fungus out. Although mulch is great, don’t allow them to get packed, try to remove it at least once in a year and also rake it flat as if it will look like you’ve just mulched.