...This is probably due to the extinction of species or genera with intermediate characteristics between extant genera. Also, the distribution is isolated, with the following species: Athrotaxis (Tasmania), Cunninghamia (Southern China, Taiwan), Glyptostrobus (Southeastern China), Metasequoia (Central China), Sequoia (Western North America), Sequoiadendron (Western North America), Taiwania (Southwestern China, Taiwan), Cryptomeria (Japan and Southeast China), and Taxodium (Southeastern North America, Mexico) (Figure). Tasmanian cedar has many seed scales on the bract scales, while Taiwan cedar has degenerated and lost the seed scales, and the ovules are on the bract scales. ... *Some of the terminology explanations that mention "Metasequoia" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…これは現生の属の中間的形質をもった種や属が絶滅したためと思われる。また分布も,タスマニアスギ属Athrotaxis(タスマニア),コウヨウザン属Cunninghamia(中国南部,台湾),スイショウ属Glyptostrobus(中国南東部),メタセコイア属Metasequoia(中国中部),セコイアSequoia(北アメリカ西部),セコイアオスギSequoiadendron(北アメリカ西部),タイワンスギ属Taiwania(中国南西部,台湾),スギ属Cryptomeria(日本と中国南東部),ヌマスギ属Taxodium(北アメリカ南東部,メキシコ)と,それぞれ隔離的に分布している(図)。タスマニアスギは包鱗上に多数の種鱗があり,タイワンスギでは種鱗が退化消失し,胚珠は包鱗上についている。… ※「Metasequoia」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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