How big is the area affected? If it is not too big, go to the grocery market, buy some corn meal. Spread it liberaly on the affected area. The corn meal fights most lawn dieases naturaly. It is also a mild fertilizer. So this is one option for you. Spread liberaly, just don't smother the grass. Wait 2-3 weeks and you should see some improvement.

Naf, I'm a procrastinator. Though I did have intentions about dealing with it, as I recall, we were out of town for several days after I posted the picture. When we returned the mold seemed to have shriveled up, though I could find it if I looked carefully. So nothing got done, but according to some of the responses I got, it is caused by poor growing conditions. So I plan to try to improve the soil in that area, and just generally try to care for the lawn better. Mostly the mold was on the boulevard part of the lawn that gets abused by the town during the winter when they plow excess street snow up on to it. That contains a lot of gravel and salt. I found it odd that none of the neighbour's boulevards had it though. My husband said he did notice it at his workplace. So I told him he brought it home on his shoes.

ok I feel stupid...Yes, they were in some potting soil that i bought that says it feeds for 3 months.So I guess that's what they are.I'm glad it's fertilizer and not some kind of critter that I needed to take care of,lol.Thanks,TD

first.. NEVER USE A CHEMICAL UNTIL YOU ID THE PROBLEM.. AND VERIFY THAT THE CHEMICAL IS RATED FOR THE PROBLEM... its a waste of money .. and dangerous ... second... why destroy part of mother natures garden show.... that was a free plant... you should have reveled in it .. for its own beauty ... is a plant only good for your garden.. if you pay for it???? it is either there because of your watering techniques or the mulch ... if in fact it is a slime mold .... research the slime mold.. and find out why its there.. if it is too much water ... or improper drainage ... then all you need do is to change how you water.. to make it not reappear ... in other words.. there never was a need for the chemicals ... please ... learn to enjoy a 'free' plant in your garden ... mushrooms are my favorite .... growwing on some long dead tree root.. pop up here or there... i used to be like you .... running out and getting rid of them because they interfered with my garden .. then i took a zen attitude about it all .. and come to find out.. they are cool ... and that is what i would think about the slime mold... did you actually get down on your belly and study it ... its probably really cool ... good luck ken