I was dog sitting on Pine Street in early July and while I was walking the dog I noticed a bright yellow fungus growing beneath a tree on some mulch and I had to take a photo - it was such a pretty color. Did a quick google search of yellow ground fungus since I didn't know what this was or if it was even fungus. Turns out (according to Steve Maczuga of Penn State) that Dog Vomit Fungus, or Fuligo septica is not a fungus, but a slime mold. 

Dog Vomit Fungus usually appears in late spring or summer following soaking rains, which makes sense since it's been such a wet summer! It can appear in mulched areas near homes and other buildings as well as in the forest. It usually has a bright yellow or sickly orange color when it is beginning its fruiting stage...which is how it got its name. The size of this species ranges from very small to very large and it is relatively harmless to plants and animals. However, be careful! This slime mold can be very slippery when in its colorful fruiting stage! 

(http://www.personal.psu.edu/sam21/dogvomit.htm)