Mitsudeuraboshi - Mitsudeuraboshi

An evergreen fern of the Polypodiaceae family. Leaf shape varies, ranging from simple to palmately divided into two or three lobes. The leaves are hard and papery, with reticulate veins with free veins. The petiole is long. The sporangia are round and arranged in a vertical row slightly closer to the midrib. There is no intumescence. Distributed throughout the country, with larger and more numerous in warmer regions. The leaves hang down on bright, dry cliffs. C. engleri does not have three lobes, and is more common south of C. trifoliata. C. veitchii grows on rock faces in the subalpine zone, and has leaves that are pinnately divided once.

[Harufumi Nishida]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

ウラボシ科の常緑性シダ。葉の形は一定でなく、単葉から、掌状に2裂、3裂するものまである。葉質は堅い紙質で、遊離脈のある網状の葉脈が走る。葉柄は長い。胞子嚢(のう)群は丸く、やや中肋(ちゅうろく)寄りに縦1列に並ぶ。包膜はない。全国に分布し、暖地ほど多く、大形である。明るい乾燥した崖(がけ)に葉を下垂させる。タカノハウラボシC. engleriは葉が3裂せず、ミツデウラボシより南に多い。亜高山帯の岩壁に生ずるミヤマウラボシC. veitchiiは、葉が1回羽状に分裂する。

［西田治文］

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