The last few evenings this stuff has popped up in my veggie bed. Literally it grows in an hour and is dead and gone by morning. A quick google says something about slime mold or 'dog vomit fungus'. Thankfully not toxic but I'm definitely rethinking the use of natural mulch in a vegetable bed. Especially since it's absolutely full of roly poly's that have eaten every single one of my beans. Gnawed right off at the base and left to rot. Thanks guys.