i noticed this thing grow under my car that has been parked for a long time now. the oil from the car used to leak and use to drip in the same area where this mushroom like thing has grown id like to noe what it is . check attachment for pic
Methinks this is a mold producing fungus, I would remove it, and definitely not breath the volatile spores.
One way to remove it , is sprinkle sand over it , then shovel it and dispose of it safely. Spray the cleaned surface with water and vinegar, or diluted bleach with water.