…The pollen does not have an air sac like the Pinaceae, and 13 to 40 prothallus cells are produced. There are three types of species: Bunja (New Zealand), whose seeds germinate underground and whose hypocotyls grow and thicken, Columbea (South America), and Eutacta (Southeast Asia, Australia), whose seeds germinate on the ground and whose hypocotyls do not grow and thicken. The morphological characteristics correspond to the geographical distribution. As fossils, they were widely distributed throughout the world, beginning in the Triassic Period and continuing through the Jurassic and Cretaceous Periods. … *Some of the terminology that mentions "Columbea" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…花粉にはマツ科のような気囊はなく,前葉体細胞は13~40個つくられる。種子が地中で発芽し,胚軸が肥大生長するブンヤ節Bunja(ニュージーランド)と,コルンベア節Columbea(南アメリカ),地表で発芽し,胚軸が肥大生長しないエウタクタ節Eutacta(東南アジア,オーストラリア)とがあり,形態的特徴は地理的分布と一致する。化石としては三畳紀にはじまり,ジュラ紀,白亜紀を通じて,全世界に広く分布していた。… ※「Columbea」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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