Characterized by relatively large, single-celled, multi-nucleate bodies called plasmodia. Plasmodia are the feeding stages of slime molds, and they are frequently seen on lawns, small plants, mulch, and decaying wood in late summer. They have a distinctive appearance that most often resembles slime, dog vomit, or a few other questionable resemblences.
Slime molds are not plant parasites, but they may injure plants by covering and shading them. Slime molds will disappear if left alone, but their unsightly appearance may necessitate more rapid removal. On mulch, they can be raked or turned under and on turf they can be mowed. They can also be broken up or washed away with a forceful spray from a garden hose. Firewood should remain free of slime colonization if it is kept covered and dry.