臺灣水韮之管束細胞

Vascular elements in the corm of Isoetes taiwanensis

Primary and secondary vascular tissues of the corm, and the vascular tissue in the leaf and root t races of the new species Isoetes taiwanensis DeVol are investigated. In the secondary vascular tissue three kinds of cells are observed i. e. parenchyma, tracheids, and sieve cells. The parenchyma cells are nucleated and filled with cytoplasm; the sieve cells have several sieve areas on their walls except on their tangential walls; the tracheids have one to several-bands of lignified secondary thickening as seen in sectional view.