…(3) The xylem of the vascular bundles contains vessels, tracheids, xylem fibers, and xylem parenchyma cells, while the phloem contains phloem, companion cells, phloem fibers, and phloem parenchyma cells. Of these, vessels, xylem fibers, and companion cells are the elements that characterize angiosperms. However, the xylem of plants such as Japanese laurel, Christmas laurel, and Illicium verum (Dorimis) contains only tracheids, without vessels or xylem fibers, and the phloem of Austrobaileya does not contain companion cells. These are considered to be primitive characteristics. … *Some of the terminology explanations that mention "Austrobaileya" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…(3)維管束の木部には道管・仮道管・木部繊維・木部柔細胞が,師部には師管・伴細胞・師部繊維・師部柔細胞などがみられ,これらのうち,道管・木部繊維・伴細胞は被子植物を特徴づける要素である。しかし,ヤマグルマ,センリョウ,シキミモドキ(ドリミス)などの木部は仮道管のみで,道管や木部繊維がなく,アウストロバイレヤAustrobaileyaの師部には伴細胞がない。これらは原始的な特徴と考えられている。… ※「アウストロバイレヤ」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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