• 作者： 江蔡淑華; 黃玲瓏
• 作者服務機構： 國立台灣大學植物學系
• 中文摘要： 睡蓮（Nymphaea tetragona Georgi）植株之所有器官都有厚壁細胞存在，而多以異型細胞方式單獨混滲在薄壁組織間，或是順沿著維管束外圍而存。成長的厚壁細胞具厚度均勻之木質化次生細胞壁，內壁有壁孔，細胞腔明顯，多數含有細胞核。外壁表面則多數具有多面形之結晶狀體。其形狀和大小變異頗大，由細長的纖維型、各種類型的分枝以至不規則、多芒狀之放射型全可找到。厚壁細胞存在的位置與其形狀關係密切，一般而言，出現在植物體較淺處（靠近表皮組織），和細胞排列較為緊密之組織內之厚壁細胞分枝較少，而出現在間隙較多之組織內者分枝較多。典型的放射型厚壁細胞幾乎全位於通氣管道附近。厚壁細胞在各器官和組織內分佈的位置亦有固定之方式，各種厚壁細胞之分佈位置和其形狀、排列方式與其在植物體內之功能之間均有一定的相關性，分枝少者可能主司支持植體，而分枝多者則兼司支持植體和調節水流之責。
• 英文摘要： Selereids are found as the form of idio-blast in all the organs in Nymphaea tetragonaGeorgi. They are arranged aporadically in theparenchymatous tissue or along the peripheryof vascular tissue. A mature sclereid alwaysretains its nucleus. Its secondary wall isuniormely thickened and lignified. The celllumen is obvious. Inner surface of the wallexhibits prominent pits, but it bears numerouscrystalline bodies on its outer surface. The sclereids vary quite widely in theirshape and size. They range from fibrous topolyarmed stellate type. The fibrous form aswell as the less-branched sclereids alwaysocccur in the tissues which the cells arecompactly arranged, or located near theplant surface. And the well ramified onesare found in the tissue which exhibits moreintercellular space. The occurrence，arrange-ment and the orientation of the sclereids areclosely related with the role of the sclereidsin the present plant.
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