Buyers check the quality of cordyceps, a fungus believed to possess aphrodisiac and medicinal powers, at a cordyceps trade market in Hainan Tibetan Autonomous Prefecture, in China's western Qinghai province June 10, 2019. Demand for the highly prized cordyceps has increased sharply in the last decade as an emerging Chinese middle class seeks it to cure everything from kidney disorders to impotence. REUTERS/Aly Song SEARCH "CHINA FUNGUS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.