The American Wild Ale is a category for all beers brewed with a strain of wild yeast during either the primary or secondary phase of fermentation.
Because of this, the American Wild Ales can vary from a very pale yellow to dark brown or black, and the flavor can range from malty to hoppy. These wild yeast and bacteria can leave an interesting flavor - funky and pleasing to some, undesirable or strange to others.
Because of the wide variation in specific beers, serving temperature can vary, but a good guideline would be cool (between 46-54 degrees) and in a pinto glass or beer mug.