Are you in the dark about mushrooms? Picking edible mushrooms in the wild can be risky business-and a practice not to be undertaken by amateurs. On this edition of Take Note, we talk with the author of the new "Field Guide to Wild Mushrooms of Pennsylvania and the Mid-Atlantic" and speak with a biologist about a little-known rodent, the Allegheny woodrat. It's a threatened species in Pennsylvania. Guests: Bill Russell & Dr. Janet Wright [Encore]