Caitonia
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Caytonia is a type of fossil plant that lived from the Devonian to the Jurassic period. The leaf blade is made up of palmately divided pinnate leaflets, and the pinnate leaflets that make up the megasporophyll contain many ovules and have an opening through which the microspores enter. The microsporophyll has an anther divided into four lobes. This species is thought to be phylogenetically connected to ferns and gymnosperms. Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information |
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〘名〙 (caytonia) 化石植物の一種。デボン紀からジュラ紀に生存した。葉身は掌状に分かれた羽小葉からなり、大胞子葉をなす小羽葉は多数の胚珠を内にくるんでいて、一つの開口があり、そこから小胞子が入りこむ。小胞子葉には四室に分かれた葯(やく)がある。この仲間は、系統上、シダ植物と裸子植物をつなぐ位置にあると考えられている。
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