白干層木栓組織之電顯補充觀察

A Supplementary Study on Melaleuca Phellem by Electron Microscope

以電顯觀察白干層（Melaleuca leucadendra L.）木栓組織作為光顯之補充研究。顯示「卡氏帶」固定存在於短型細胞之垂周細胞壁上。且在幼細胞上之「卡氏帶」較老細胞上者更為明顯。波浪式皺紋細胞壁也只於短型細胞之垂周壁上才可找到。基於原生質連絡絲、細胞內含物和「卡氏帶」之存否等事實，短型細胞應認為是較長型細胞更為特化之細胞。木栓質出現後，細胞仍行擴大生長。

The supplemental observation by EM is made for the phellem of Melaleuca leucadendra L. The EM survey clearly provides the site of ''casparian strip'' on the anticlinal wall of short cell. The ''casparian strip'' in the young cell is more conspicuous than that in the older cell. The wrinkled wall exhibits only on the anticlinal wall of young short cell. Basing on the absence of plasmodesmata, cytoplasmic contents and the presence of ''casparian strip'', the short cell is suggested as more specialized than the long cell. The cell expansion occurs after the appearance of suberized wall.