I find this substance in my yard occasionally. The only critters on the property are squirrels, opossums, rabbits, and skunks. I don’t think it’s any of them. It has the consistency of cottage cheese, and no discernable odor. I shot a video and here’s a picture
http://i140.photobucket.com/albums/r9/IAMSWUTIAMS/CameraZOOM-20150207093607575_zpsqmqxhsq1.jpg
Before anybody ask, no I didn’t taste it.
fungus. I had some in my last batch of multch
I think it looks like a slime mold, spread by beetles.
Look up dog vomit slime mold, it might be a match.
The mulch is a year old. And I’ve found it on the grass before.
I think you’re right.
http://organicgardening.about.com/od/diseases/a/Identifying-And-Controlling-Dog-Vomit-Fungus.htm
You can find the answer to anything here. The collective mind thing. 
What ever you do don’t pock it with a stick! :-;;
Too late.