My neighbor put some new mulch on mother's day and with the wet year we've had has a fungus growing in it. She left her house one day at 4:00 pm and everything was ok. She got home around 8:00 pm and this stuff was growing. I was there finishing the mowing & she pointed it out and asked me what it was. There were 4 spots about 6" long and 4" across. It was a mustard yellow or a little lighter and looked like spilled paint, and sticky to the touch. It was even creeping up the foundation. I was back a few days later and it looked like sprayed foam insulation, even the same color, dirty beige. She has diligently been trying to get rid of it (wears latex gloves, she's a retired RN) pulling it up and disposing of it. It has gotten into a climatis plant and looks like it may kill it (turning black at the base). What can we do to get rid of it short of replacing the mulch as I feel it may return even then? Any ideas?