Nayoshida (English spelling) Common bladder fern

Japanese: ナヨシダ（英語表記）common bladder‐fern

A temperate fern of the Melastomataceae family that usually grows on rocks, is relatively small, and has a delicate appearance. Summer-green. The rhizome is ascending or short, and the base of the petiole remains dead. The leaves are lanceolate along with the base of the petiole, entire, and light brown with membranous scales. Petiole is 5-15 cm long. The leaf blade is ovate-lanceolate to elliptic-lanceolate, thin, herbaceous, 10-20 cm long, glabrous, bipinnately compound. The pinnae are centrally lobed, and the veins are free. The sporangia are circular and grow above the veins. The enthesium covers the sporangia from behind, but is laid over them as the sporangia mature and grow.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

通常岩上に生え，比較的小型で，なよなよとひ弱な感じを与えるメシダ科の温帯性シダ。夏緑性。根茎は斜上または短くはい，葉柄基部が枯れ残る。葉は葉柄基部とともに披針形，全縁で，淡褐色で薄膜質の鱗片がつく。葉柄は5～15cm。葉身は卵状披針形～楕円状披針形，薄い草質，10～20cm，無毛，2回羽状複葉。小羽片は中裂し，葉脈は遊離脈。胞子囊群は葉脈の上につき，円形，包膜はうしろから胞子囊をおおうが，胞子囊が成熟して大きくなるとそれに敷かれる。

出典　株式会社平凡社世界大百科事典第２版について　情報

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