Wood fern (Buckler Fern)
(Dryopteris crassirhizoma )

The wood fern is a large-sized fern found in Oirase. As its name suggests, it spreads its leaves “magnificently.”


(Arachniodes standishii )

This fern has a delicately beautiful design like a cut paper art. As its name, Ryomen (both sides) indicates, the two sides have nearly the same appearance.


Cross fern
(Polystichum tripteron )

The characteristic shape of a cross is apparent when accurately observing each leaf.


  retroso-paleaceum )

This is representative of larger ferns in Oirase, along with the male fern. It is characterized by scales clamped downward on rachis, which look like Sakage (hair standing in reverse).


Ostrich fern
(Matteuccia struthiopteris )

A wild vegetable named Kogomi, it grows upwards and spreads its leaves, surprising many people as it begins to look exactly like a fern.


(Stegnogramma pozoi
  subsp. Mollissima )

These ferns are commonly seen decorating paths by the roadside. There is soft hair on both the stem and stalk, which you can observe when looking them closer.


(Osmunda japonica )

Faced with Osmund, which has the look of a curly wild vegetable, you may be surprised by the gap in appearance between leaves that are coiled and those that spread out in summer.


Oriental ostrich fern
(Pentarhizidium orientale )

The plant is characterized by having rough, indented margins of large leaves. In its Japanese name, Inu means "dog (inedible, or no use)” and Gansoku means "Ostrich fern."


(Dennstaedtia wilfordii )

The appearance of margins of leaves resembling the wildflower Oren (Coptis japonica) are quite delicate. It grows on stone walls and on the roadside along streams.


Japanese deer fern
(Blechnum nipponicum )

Being hard to look at and touch gives this plant an extremely sturdy impression. The Japanese name Shishi-gashira (lion mask) compares its appearance to a lion’s mane.


(Leptorumohra miqueliana )

As the Japanese name Hosoba (thin leaf) shows, lacinia is delicate and beautiful. When enwrapped by palms, the texture resembles that of lace. To fully enjoy this flower, it is highly recommended you touch it.


(Botrychium multifidum
  var. robustum )

This plant might give you the impression of “a grass” rather than a fern. The glossy green color and the texture of its thin leaves, finely incised leaves remind one of a foliage plant.


Scoring (Dutch) rush
(Equisetum hyemale)

A familiar plant in Japanese gardens, it reminds one of a huge green horsetail. It has a rough feel when touched.


(Lycopodium serratum
  var. serratum)

This evergreen fern resembles Setaka-sugi-goke (Pogonatum japonicum). As the leaves are broad, it is sometimes mistaken for a seed plant. Plant colonies are found in some parts of the upper stream.


Northern maiden hair
(Adiantum pedatum)

This fern has a beautiful design resembling a male peacock spreading a tail. It adds color to stone walls in Oirase.


Hart's-tongue fern
(Asplenium scolopendrium)

This fern’s rough design might cause one to say “Eh? Is that really a fern?” but it is fascinating for its deep green leaves that shine against sunlight filtering through the trees.


Wright's filmy fern
(Hymenophyllum wrightii)

A small-sized fern sometimes mistaken as moss, it forms a plant colony underneath big rocks.


(Vandenboschia nipponica)

A fine fern with a more complicated design than filmy ferns (Hymenophyllaceae), it creates a colony under rocks, mainly along the upper stream.


Tiny bristle fern
(Crepidomanes minutum)

This small fern only looks like moss. As its name Uchiwa (fan) indicates, it has a beautiful fan-shaped design. When dried, the leaves shrink and become moss-like.


(Crypsinus hastatus)

The name ura-boshi (underside-star) derives from the appearance of “stars” on the underside of the leaves comparable to sporangium. In Oirase, Mitsude (three hands; three-forked leaf) is not found, but there is one with a simple leaf and an auricle.


Hare's-foot fern
(Davallia mariesii)

An epiphytic fern found on trees, it is famous for its geometric beauty and commonly called Shinobu Tama (moss ball).


(Lepisorus annuifrons)

The name Hotei (cloth bag)-shida (fern) may not ring a bell at first. This is a representative example of an epiphytic fern that grows on tree trunks in Oirase.


Oshagujidenda fern
(Polypodium fauriei)

An epiphytic fern growing on trees, this wintergreen plant curls up when dried.


(Lycopodium cryptomerinum)

A rare, evergreen fern belonging to the family Lycopodiaceae, the leaves resemble those of a cedar tree on first sight. It grows on mossy trees and older, bigger ferns begin to droop.