Unripe pine cones are just amazing as a source of wild yeasts. Place a few cones into sugar water (15% sugar - 85% water per volume). These pinyon pine green cones already started fermenting in a day. After 2-3 days, the liquid can be used as a starter for wonderful fermented concoctions. Use 1/2 pint starter for one gallon of brew. Experimental extension from the book "The New Wildcrafted Cuisine" http://www.amazon.com/New-Wildcrafted-Cuisine-Exploring-Gastronomy/dp/1603586067