From what I heard talking to a friend Morel mushroom season has arrived in southern Pennsylvania.  According to one of my friends, a coworker of his claims to have picked almost 2 pounds of morels while searching in the woods this past weekend. 
The season is short, so if you want to mushroom hunt for them you should do so soon.  To find morels search in areas of moist ground near dead trees like ash, sycamore, elm, and apple.  Also, they can be found on the ground in areas covered with leaves.  Where you find one there will likely be more nearby.  When picking morels, cut them at the stem instead of removing from the root.  Also, carry the morels in a burlap bag (not plastic) this is so that while the mushrooms are rubbing around with each other they release the spores onto the ground where you searched, so in future years your mushroom location will have more mushrooms. 

Morels are tan to dark colored, cone shaped, with a hollow cap.  They also have a spongey appearance.  In hieght they 2-4 inches tall.  Be careful not to get poisonous false morels, careful examination of the caps can help tell the difference.

Happy mushroom hunting.