…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 explanations that mention "Paratrizygia" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…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。… ※「Paratrizygia」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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