Xú Shàn 徐善, zì Pántán 槃談, zìhào Shuāngguì jūshì 雙桂居士, lay scholar of Zuìlǐ 檇李 (= Jiāxīngfǔ, Zhèjiāng). Author of the front-preface to the 1-juan 《耳庵嵩禪師語錄》 (KR6q0453), in which he locates Ěrān Sōng 嵩 as Jìngshān Dàhuì shíliù shì sūn ér Zhàozhōu Sānbāzhǎng héshàng zhī gāodì 徑山大慧十六世孫而趙州三巴掌和尚之高弟 — situating the Jùyúnpài 聚雲派 (Tiěméi → Ěrān) within the broader LínjìYángqí Dàhuì transmission. The preface signs Zuìlǐ Shuāngguì jūshì Xú Shàn Pántán zhuàn 檇李雙桂居士徐善槃談撰; no other works located.