Thanks to Ron Reese for sending in these great photos of slime molds! I’ve seen the purple-gray type before but I have not seen the orange one.
Slime molds do not damage the turf. They do not invade the plant tissue – they eat bacteria on the surface. If they are a nuisance you can use a rake or broom to dust them away, or blast with a hose. Or, just keep them around as a fun conversation piece in your grass.
Slime molds will also grow in mulch, on tree stumps, and on other areas of the landscape.