Native of the Tibetan Plateau Cordyceps sinensis--or dongchong xiacao (winter bug, summer grass), as it is known in Chinese--is a fungus described rather mysteriously in the Supplement to the Compendium of Materia Medica as "In winter a bug, in summer a grass, it has hair and can move."
青康藏高原的嬌客在《本草綱目拾遺》中記載冬蟲夏草「冬為蟲，夏為草，有毛能動」，描述上充滿了神秘色彩。