Pyrrosia lingua. P. sheareri.  石 苇 Shí wěi  Tongue fern, Large Pyrrosa   Family: Polypodiaceae      
PART USED: Dried leaf- harvested year round.
A species of epiphytic fern endemic to Taiwan
Nature: Cool, neutral       FLAVOR: Bitter, sweet, bland  CHANNELS: Lung, Bladder
FUNCTIONS
GROUP: Diuretic
1. Clears Damp Heat and unblocks painful urinary dysfunction.[5]
2. Clears Heat and stops bleeding.[5] Sedate Heat. Clears fevers.[1] Styptic.[1,4]
3. Clear Lung, expel phlegm.[2,5]
ACTIONS
INDICATIONS- Not as commonly used as Polygonum aviculare- Bian xu, though more effective as diuretic and clear Heat.[4]
1. Urinary tract infections.[1,2] Hot stony, or bloody painful dysuria due to Damp Heat.[5] Diminished urination, acute nephritis with edema.[2] Nephritic edema, urinary tract stones, hematuria.[2] Ease urination problems caused by Hot gonorrhea.[1,4] Sandy urine.[4]
2. Lung Heat coughs and wheezing.[5] Lung Fire manifesting as hemoptysis. Cough due to Hot Lungs.[2]
3. Bleeding due to reckless movement of Hot Blood; hematemesis,[4,5] uterine bleeding, and painful hematuria.[5]
CONTRAINDICATIONS: Use with caution in the absence of Damp Heat.[5]
COMBINATIONS
PREPARATIONS: Decoction. Whole plant  9-15 g of the dry herb, or 3-6 g of the fresh herb.[1] Dried leaf 6-12 g.[2] 6-30 g.[4] 3-9 g.[5] In severe cases up to 30 g may be used.[5] Good quality is big, thick, and has a hairy texture on one side.

NOTES
This herb has a very strong urinary stone removing action. It can be used alone to stop bleeding.[3]
HABITAT: Grows in dark damp places on hilly slopes, between rocky crevices, and along cliffs.
DESCRIPTION: Perennial herb. Rhizomes; slender and stoloniferous, covered densely by brown scales. Leaves; growing sparsely from the stem, coriaceous, narrow lanceolate, apexes acuminate, bases narrow, margins intact, leaf surfaces dark green, undersides rusty-colored, covered densely by powdery and granular sori, petioles noded at base, covered by stellate hairs.
References
Inner Path can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.
Constituents

 Research

Lithagogue effects of Pyrrosia lingua from Guizhou province on experimental renal calculus in rats. [Article in Chinese]
Wang YR, Yang WD.
Abstract
To screen the active fractions with lithagogue effects of Pyrrosia lingua from Guizhou province and preliminarily investigate its mechanism. The rats were fed with 1% ethylene glycol and 2% ammonium chloride to establish the nephrolithiasis models, which were used to evaluate thelithagogue effects of different polar fractions of P. lingua from Guizhou province. The level of urinary calcium and oxalic acid in urine, renal calcium, oxalic acid, superoxide dismutase (SOD), catalase(CAT) and malondialdehyde (MDA) in renal tissues,as well as crystalline deposit and lithogenesis in renal tissues and the levels of creatinine(Cr) and blood urea nitrogen (BUN) in the serum were detected. The effective compounds were inferred from the analysis of active fractions extract based on LC-MS technology. Petroleum ether fraction and dichloromethane fraction of P. lingua from Guizhou province can reduce renal oxalic acid and renal calcium concentration, increase urinary oxalic acid and urine calcium, with significant inhibitory effect on the formation of renal calculus in rats, significantly increase SOD and CAT activities in renal tissues, and significantly reduce MDA levels. LC-MS analysis showed that the caffeine, citric acid and tartaric acid among the compounds from petroleum ether fraction and dichloromethane fraction had lithagogue effects. Both the petroleum ether fraction and dichloromethane fraction of P. lingua from Guizhou province showed good effect on prevention and treatment of calculus in middle dose groups, and the mechanism may be associated with antioxidation, reducing calcium oxalate crystal deposition, and promoting calcium oxalatecrystal release, in addition, caffeine, citric acid and tartaric acid had lithagogue effects.
PMID: 30200732 Zhongguo Zhong Yao Za Zhi. 2018 Aug;43(16):3291-3300. doi: 10.19540/j.cnki.cjcmm.20180514.005. ncbi.nlm.nih.gov