I just received an email from my local Mississippi Extension Service. The Service director has continued to search for information concerning this (Slime Mold) lawn problem. She has been in contact with a Mississippi Extension Service Plant Pathologist (PhD) and he says he thinks my neighbor and I have Nostoc, an algae, not Slime Mold. He wants to drop by and examine what we have, diagnosis the problem, and kill/control it. He says IF it is indeed Nostoc, there is an experimental chemical that he has access to and he would like to use our two yards as test sites.
I will let you know what happens.