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(Upload on November 28 2023) [ 日本語 | English ]

Dryopteris Adans. (オシダ) Oo-itachishida (オオイタチシダ, 大鼬羊歯), Pacific wood fern (tentative) Lifeform: rhizomatous, evergreen perennial fern Distribution: China - Korea - Japan (south to Tohoku District) Habitat: forest edges, slopes and moist rocky walls in low to mid-elevation Morphology: diverse variations often classified into several distinct forms Chromosome number: n = 123 (3x, triploid) - apomixis

Synonyms: Dryopteris pudouensis Ching Dryopteris varia (L.) Kuntze var. hikonensis (H. Itô) Sa. Kurata Dryopteris pacifica auct. non (Nakai) Tagawa, often used Dryopteris hikonensis (H. Itô) Nakaike

Dryopteris immixta in Japan

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1 2 3
[1-3] at a foot of Mount Kakuda (角田山) in the former Maki Town, Niigata Prefecture, central Honshu, collected on October 17 1990. The specimens are kept in SAPS.