けほしだ (毛穂羊歯) [Index] [Back] わが国の本州、福島県・新潟県以西から四国・九州、それに台湾や朝鮮半島、中国、東南アジア、インドに分布しています。山野や道ばたなどに生え、高さは５０〜１００センチになります。葉は広披針形で、２回羽状中裂します。葉柄はわら色で、基部には暗褐色の鱗片がつきます。最下の１〜２対は下向きに曲がり、先は尾状に細くなります。胞子嚢群は円形で、裂片の辺縁と中肋の中間か、やや辺縁寄りにつきます。台湾華語では「密毛小毛蕨」、中国語では「華南毛蕨（hua nan mao jue）」と呼ばれます。 ヒメシダ科ヒメシダ属の常緑シダ類で、学名は Thelypteris parasitica (syn. Cyclosorus parasiticus)。英名は Parasitic maiden fern。 The Parastic maiden fern (Thelypteris parasitica) belongs to the family Thelypteridaceae. It is an evergreen fern that is distributed from Fukushima and Niigata prefectures westward on Honshu, through Shikoku and Kyushu, as well as in Taiwan, the Korean Peninsula, China, Southeast Asia, and India. It grows in mountainous areas and along roadsides, reaching a height of 50 to 100 cm. The leaves are broadly lanceolate and twice pinnately lobed. The petioles are straw-colored, with dark brown scales at the base. The lowest one or two pairs of leaves curve downward, tapering to a tail-like point at the tip. The sori are round and are located either midway between the margin of the lobe and the midrib, or slightly toward the margin. In Taiwanese Chinese, it is called "密毛小毛蕨", and "華南毛蕨" (hua nan mao jue) in Chinese. 大分県九重町「小松地獄」にて、2026年05月14日撮影。 Shu Suehiro shu@botanic.jp