| 释义 |
bicollateral, a. Bot.|ˌbaɪkəˈlætərəl|
[bi-2.]
Of a vascular bundle: having two masses of phloem on opposite sides of the xylem. (See collateral A. 1 e.) Hence ˌbicoˌllateˈrality.
1881Encycl. Brit. XII. 18/1 In Cucurbita, Solanum, and others the bundles are ‘bicollateral’, there being an additional phloem portion inside the xylem. 1882Vines tr. Sachs's Bot. 949 Bicollateral bundles, in which..there is a layer of phloëm on the inner as well as on the outer side of the xylem. 1884Bower & Scott tr. De Bary's Phaner. 319 A special subordinate form, to be called the double collateral or bicollateral, is distinguished from the usual one by the fact that two phloem groups lie on opposite sides of one xylem group. 1900W. Wallace in Ann. Bot. Dec. 640 Most Cucurbitaceæ have bicollateral bundles. Ibid. 641 Weiss adopts this conception of bicollaterality. 1953K. Esau Plant Anat. xv. 355 The presence of phloem on both sides of the xylem makes the bundle bicollateral. |