From Wikipedia, the free encyclopedia http://en.wikipedia.org/wiki/Trametes_versicolor
Trametes versicolor — formerly known as Coriolus versicolor and Polyporus versicolor— is an extremely common polypore mushroom which can be found throughout the world. Versicolor means 'of several colours' and it is true that this mushroom is found in a wide variety of different colours. T. versicolor is commonly called Turkey Tail because of its resemblance to the tail of the wild turkey. T. versicolor is recognized as a medicinal mushroom in Chinese medicine under the name yun zhi (simplified Chinese: 云芝, traditional Chinese: 雲芝). In China and Japan T. versicolor is used as in immunoadjuvant therapy for cancer.