...They were also called cycad ferns because they have cycad-shaped stems and fern-shaped leaves, but now the name fern seed ferns is used to mean plants with seeds on fern-shaped leaves. The first seeds, named Archaeosperma (illustration), were discovered and reported at the end of the Devonian period, but all others appeared after the Carboniferous period. Based on the structure of the stem, they are divided into the true columnar Lyginopteridales and the multi-columnar Medullosales. ... *Some of the terminology explanations that mention "Archaeosperma" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…ソテツ型の茎とシダ型の葉をもつことからソテツシダ類とも呼ばれたが,現在ではシダ型の葉に種子をつけた植物という意でシダ種子類の名が使用されている。デボン紀末にアルカエオスペルマArchaeosperma(イラスト)と名づけられた最初の種子が発見報告されたが,これ以外は全部石炭紀以降に出現した。 幹の構造により真正中心柱型のリギノプテリス目Lyginopteridalesと,多条中心柱型のメデュロサ目Medullosalesに分けられる。… ※「アルカエオスペルマ」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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