| 释义 |
polystelic, a. Bot.|pɒlɪˈstiːlɪk|
[a. F. polystélique (P. van Tieghem & H. Douliot 1886, in Ann. Sci. Nat. Bot. 7 ser. III. 276), f. poly- + stele 2 + -ic.]
Of a stem or root: having more than one internal vascular cylinder or stele. So ˈpolystele (see quot. 1965); ˈpolystely, polystelic condition.
1891Ann. Bot. V. 515 In the Cryptogams above cited..the original cylinder branches and the stem becomes polystelic. Ibid. 516 The two Dicotyledonous genera, in which alone, so far as we know, polystely prevails, belong to families remote from each other. 1896Cormack in Trans. Linn. Soc., Bot. Ser. ii. V. 275 His description of the polystelic condition of stems of Pteridophyta. Ibid., With polystelic roots must be classed certain abnormal Palm-roots. 1902Phil. Trans. R. Soc. B. CXCV. 128 In Anemia phyllitidis the adult stem is characterised by the presence of so-called polystelic structure. 1902Encycl. Brit. XXV. 413/2 This is the condition of astely, entirely parallel with polystely except that the separate strands are usually all or mostly leaf-traces. 1908Boodle & Fritsch tr. Solereder's Systematic Anat. Dicotyledons II. vi. 1156 When the axis shows several steles in a transverse section, it is said to be polystelic. 1925Eames & MacDaniels Introd. Plant Anat. v. 133 In contrast with the monostele was the ‘polystele’, a type of stele in which the vascular tissues are in the form of strands. 1938Current Sci. VI. 383 Polystely occurs in the cortical region of the stolons. Ibid. 384 The polystelic condition observed in these plants might be regarded as the anatomical expression of the renewed adoption of the terrestrial habit. 1965Bell & Coombe tr. Strasburger's Textbk. Bot. 136 We come..to the polystele, consisting of a system of individual vascular bundles, distributed over the whole of the transverse section. 1969F. E. Round Introd. Lower Plants x. 125 (caption) Stellar arrangements in the vascular cryptogams... N1 polystele. |