Japanese name: ヒトツバ（一葉） Scientific name:Pyrrosia lingua
[Overview]
An evergreen fern 30–40 cm tall that grows epiphytically on somewhat dry rocks and on trees.
It may also grow in colonies on the ground.
The rhizome is about 3 mm in diameter, extends long and horizontally, and is densely covered with scales.
The leaves are simple, ovate to broadly lanceolate, thick and leathery.
The underside of the leaf is densely covered with grayish brown stellate hairs, and the upper surface also has some stellate hairs.
The leaf margins are entire.
The leaf stalk is 7–20 cm long, and may be longer on leaves that bear spores; it is covered with pale brown stellate hairs.
The sori are round and cover the whole underside of the leaf.
[Uses]
The whole plant is used as a crude drug.
[Cultivation]
It prefers sun to partial shade and a moderately moist place.
It is hardy and easy to grow.
When the surface of the planting material dries, water thoroughly, and it is good to wet the leaves and stems as well.
Fertilizer is not particularly necessary.
