Mountain fern (scientific name: Camptosorus sibiricus Rupr.) is a small, rocky fern of the Asplenium family and the genus Asplenium. The plant height can reach 20 cm. The rhizome is short, erect, and the apex is densely covered with small scales; the scales are lanceolate, dark brown membranous, and entire. The leaves are clustered; the basal leaves are sterile, the leaves are elliptical, blunt, the base is broad and wedge-shaped, the fertile leaves are larger, lanceolate, narrow wings extend down to the petiole, and the apex is acuminate, capable of rooting and reproducing vegetatively. The veins of the leaves are reticulate, the small veins outside the mesh are separated, and the leaf grass is dark green after drying and hairless. Sporangium clusters are linear or oval, with narrow caps, homomorphic, membranous, gray-green or light brown.
Distributed in China Heilongjiang, Jilin, Liaoning, Inner Mongolia, Hebei, Shanxi, Shaanxi, Shandong, northern Jiangsu, Jiangxi, Henan. It is also distributed in North Korea, Japan and Russia (Far East). It grows on the rocks under the forest at an altitude of 300-2000 meters.

Chinese folks often use the whole herb of Pteris serrata to treat gangrene, neurodermatitis, hemiplegia caused by cerebrovascular embolism, uterine bleeding, traumatic hemorrhage and lower limb ulcers. Mountain fern is also an ornamental fern, often used to configure rock bonsai and small potted plants.