Common after rain in warm weather. Look like the BLOB and most common cause of panic calls to extension people. Often brightly colored plasmodium is yellow or orange and moves like a slug. They have no cell wall until fruiting occurs and spores are formed.
Spores germinate to form zoospores and then the myxamoebae which fuse to form the plasmodium.
This creeps around and then fruits forming sporangia containing lots of walled resting spores. No control is usually required other than hosing, mowing or raking. They are sensitive to fungicides if problem is serious. Secondary disease cycles by zoospores. The diseases caused by these fungi are locally serious and usually root rots or diseases below the soil line.