中華傳心地禪門師資承襲圖 by Zongmi 宗密. (Chart of the Master-Disciple Succession of the Chan Gate that Transmits the Mind Ground in China), in one fascicle, written between 830 and 833, in reply to Pei　Xiu's　裴休 questions about the teachings and lineal filiations of four of the major Ch'an traditions current during the late Tang.