Join mushroom expert Susan Hopkins for a casual walk in the woods from 10 a.m.-12:30 p.m. as she searches for mushrooms and fungi. We will identify and discuss poisonous and edible species and learn about the medicinal value, too. This walk will take at least two hours and will be held rain or shine. Bring a lunch if you want to stay longer to use Hopkins' books and reference materials. Preregistration required by 5 p.m. the day before. Call 518-327-6241. Other dates: Wednesday, Aug. 13; Sunday, Aug. 17; Wednesday, Aug. 27; and Sunday, Aug. 31.