I describe Athyrium bipinnatum sp. nov. and discuss morphological differences between closely related species. The new species is endemic to Japan, occurring on the islands of Honshu, Kyushu, and Shikoku. Based on the criteria of the International union for conservation of nature and natural resources, this new species is here considered endangered.

中文翻译：

---

Athyrium bipinnatum K.Hori（Athyriaceae），来自日本的一种新的类鳞翅目蕨。

我描述了Athyrium bipinnatum sp.。十一月 并讨论密切相关物种之间的形态差异。该新物种是日本特有种，出现在本州，九州和四国的岛屿上。根据国际自然和自然资源保护联盟的标准，​​该新物种在这里被视为濒危物种。