Got the following information from Destihl Brewing’s website and also the picture is courtesy of http://www.craftcans.com.

Our new Wild Sour Series includes several beer styles that derive their tartness from wild fermentation in an extended sour mash process. Unlike our Saint Dekkera® Reserve Sour Series, which are long-term aged and soured in oak barrels, our Wild Sour ales not barrel-aged, but they are still soured with our same spontaneous, wild creatures derived from our Reserve Sour barrels.