Trizygia

Japanese: Trizygia
Trizygia

... The Gondwana continent is characterized by the Glossopteris flora (or Gondwana flora), which is made up of 90% of the Glossopteris species with ligulate leaves and reticulate veins. It is fundamentally different from the northern hemisphere flora, which is made up of a wide variety of plants, suggesting that it appeared under a harsh environment. Other species that occur in the Gondwana continent include the macrophyllous Palaeovitcharia and Gondwanidium , the arthropod Schizoneura , the cuneate Trizygia ( Sphenophyllum ), and the conifer Noeggerathiopsis . [Asama Kazuo]...

From [Sphenophyllum]

…The wedge-shaped leaves, which grow whorled at the nodes, usually have six leaves, and do not fuse together to form a leaf sheath like horsetails. In the Western flora, it flourished in the Carboniferous period, but in the Cathaysian flora of East Asia, it flourished in the Permian period and became more differentiated, splitting into four genera: Sphenophyllum, which has circular leaves with straight veins ; Parasphenophyllum , which has outward-curving veins; Trizygia , which has three pairs of leaves with straight veins; and Paratrizygia , which has outward-curving veins. In Japan, leaves from the three genera Parasphenophyllum, Trizygia, and Paratrizygia have been reported from the Permian of Maiyama, Miyagi Prefecture. …

*Some of the terminology that mentions "Trizygia" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

… ゴンドワナ大陸を特徴づけるのは舌状単葉で網状脈をもったグロッソプテリス類が全体の9割も占めるグロッソプテリス植物群(またはゴンドワナ植物群Gondwana flora)で,北半球の多種多様な植物で構成されている植物群とは根本的に異なり,きびしい環境の下に出現したことを暗示している。共に産するものとして大葉類のPalaeovittaria,Gondwanidium,有節類のSchizoneura,楔葉類のTrizygia(Sphenophyllum),針葉樹類のNoeggerathiopsisなどがある。【浅間 一男】。…

【スフェノフィルム】より

…節に輪生するくさび形の葉は通常は6枚で,トクサ類のように癒合して葉鞘(ようしよう)を作ることはない。欧米植物群では石炭紀に栄えたが,東アジアのカタイシア植物群では二畳紀に栄えてより分化し,葉が円形に配列し脈が直走するスフェノフィルム,脈が外側に湾曲するパラスフェノフィルムParasphenophyllum,葉が3対生し脈が直走するトリジギアTrizygia,脈が外側に湾曲するパラトリジギアParatrizygiaの4属に分かれた。日本では宮城県米谷(まいや)二畳系からパラスフェノフィルム,トリジギア,パラトリジギアの3属の葉が報告されている。…

※「Trizygia」について言及している用語解説の一部を掲載しています。

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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