Herbs that Drain Dampness

How is Zhu Ling (polyporus) different from Fu Ling (poria)?

Both Fu Ling and Zhu Ling are funguses. But Zhu Ling is cooler, better at promoting urination, and does not tonify.

Source: Bensky, D. (2004). Chinese Herbal Medicine: Materia Medica. Seattle, WA: Eastland Press. p. 271 [Q820]