The mushroom Auricularia polytricha, belonging to heterobasidiae of basidiomycetes and also called Jew’s Ear, wood ear, red ear, black tree fungus or ear fungus, is frequently consumed as a food and a traditional medicine in the far east. Its nutritional value and taste components have been investigated (Mau,Wu, Wu, & Lin, 1998), and a few studies have reported its biological activity and active substances. Hammerschmidt (1980) and Hokama and Hokama (1981) reported that A. polytrich contains a plateletaggregating inhibitor, which is present in the crude dialysates of aqueous A. polytrich extracts.