Cordyceps, also known as Caterpillar Fungus and which can sell for up to 90$ per gram, are exposed at a market in Yushu, a county-level city of Yushu Tibetan Autonomous Prefecture in the southern part of Qinghai province on May 30, 2016. The city is 3700m above sea level. (Photo by Giulia Marchi/The Washington Post)





A Tibetan woman cleans Cordyceps at a market in Yushu, a county-level city of Yushu Tibetan Autonomous Prefecture in the southern part of Qinghai province on May 30, 2016. The city is at 3700m above sea level. Cordyceps, also known as Caterpillar Fungus, can sell for up to 90$ per gram. (Photo by Giulia Marchi/The Washington Post)





A Tibetan woman sells Cordyceps at a market in Yushu, a county-level city of Yushu Tibetan Autonomous Prefecture in the southern part of Qinghai province on May 30, 2016. The city is at 3700m above sea level. Cordyceps, also known as Caterpillar Fungus, can sell for up to 90$ per gram and it's used in traditional Chinese medicine to treat cancer, impotence and many other diseases. (Photo by Giulia Marchi/The Washington Post)





Tibetan men sell Cordyceps at a market in Yushu, a county-level city of Yushu Tibetan Autonomous Prefecture in the southern part of Qinghai province on May 30, 2016. (Photo by Giulia Marchi/The Washington Post)





View of Yushu, a county-level city of Yushu Tibetan Autonomous Prefecture in the southern part of Qinghai province on May 30, 2016. The city is at 3700m above sea level. Atop the hill lies the Thrangu Monastery, which was in part destroyed by the earthquake in 2010 and is now rebuilt. (Photo by Giulia Marchi/The Washington Post)





A Tibetan woman with horses in a remote area of the Yushu Autonomous Prefecture of the Tibetan Plateau on May 31, 2016. (Photo by Giulia Marchi/The Washington Post)





The family of Chu Tsering, 47, pose for a portrait on his motorbike while on their way to the harvest of the Cordyceps, also known as Caterpillar Fungus, on the mountains in the surroundings of Xiaosumang Township, on May 31st, 2016. (Photo by Giulia Marchi/The Washington Post)





The mountains in the surroundings of Xiaosumang Township on the Tibetan Plateau, on May 31st, 2016. (Photo by Giulia Marchi/The Washington Post)





Longjiang, 12, in search of the prized Caterpillar Fungus on the mountains in the surroundings of Xiaosumang Township, on May 31st, 2016. (Photo by Giulia Marchi/The Washington Post)





A Caterpillar Fungus spotted during the harvest on the mountains nearby Xiaosumang Township on May 31, 2016. (Photo by Giulia Marchi/The Washington Post)





Longjiang, 12, picking up the prized Caterpillar Fungus on the mountains in the surroundings of Xiaosumang Township, on May 31st, 2016. (Photo by Giulia Marchi/The Washington Post)





Tibetan women pose for a portrait on the mountains in the surroundings of Xiaosumang Township, during the harvest of the prized Caterpillar Fungus on May 31, 2016. (Photo by Giulia Marchi/The Washington Post)





Tibetan people on the mountains in the surroundings of Xiaosumang Township, in search of the prized Caterpillar Fungus on May 31, 2016. (Photo by Giulia Marchi/The Washington Post)





A Tibetan man shows a freshly picked up Caterpillar Fungus on the mountains in the surroundings of Xiaosumang Township, on May 31st, 2016. (Photo by Giulia Marchi/The Washington Post)





A Tibetan family on the mountains in the surroundings of Xiaosumang Township, during the harvest of the prized Caterpillar Fungus on May 31, 2016. (Photo by Giulia Marchi/The Washington Post)





Tibetan women in search of the Caterpillar Fungus on the mountains in the surroundings of Xiaosumang Township on May 31, 2016. (Photo by Giulia Marchi/The Washington Post)