13. Pyrrosia petiolosa (Christ) Ching, Bull. Chin. Bot. Soc. 1: 59. 1935.
有柄石韦 you bing shi wei
Polypodium petiolosum Christ, Nuovo Giorn. Bot. Ital., n.s., 4: 96. 1897; Cyclophorus petiolosus (Christ) C. Christensen; Niphobolus petiolosa (Christ) Diels.
Plants 5-15 cm tall. Rhizome long creeping, 1-2.5 mm in diam.; phyllopodia 0.5-2.5 cm apart, in cross section with few scattered sclerenchyma strands, lateral buds alternating with phyllopodia. Scales peltate, 2.2-4.4 × 0.6-1 mm, base entire to dentate; acumen dull brown with a shiny black spot near attachment, ciliate. Fronds slightly dimorphic, stipitate. Sterile fronds: stipe 1-16 cm, (0.06-)0.2-1.5 × as long as lamina; lamina 1.5-7(-10.5) × 0.7-2.2(-3.3) cm, widest near middle, base cuneate to attenuate, apex acute to rounded. Fertile fronds: stipe 0.5-12 cm, 0.5-1.5 × as long as lamina, 1-8.5 × 0.5-2 cm. Hydathodes distinct, distinctly sunken. Indument persistent, monomorphic, dense, light gray to brown; hairs 0.4-0.6 mm in diam., with appressed, boat-shaped rays. Sori superficial, without central bundle of paraphyses. Sporangia with stalks 1-2 × as long as capsule.
Mostly on dry and open rocks; 200-2200 m. Guizhou, Hebei, Henan, Hubei, Jiangsu, Jilin, Shaanxi, Shandong, Shanxi, Sichuan, Yunnan, Zhejiang [Korea, Mongolia, Russia].
The whole plant is used in traditional Chinese medicine.