| 释义 |
‖ calyptra Bot.|kəˈlɪptrə|
In 8 calyptre.
[mod.L. a. Gr. καλύπτρα covering, veil, f. καλύπτειν to cover. Cf. F. calyptre.]
A hood or cover; spec. a. the hood of the sporecase in mosses; b. ‘the interior membranaceous and often hairy covering of the ovarium’ (De Candolle and Sprengel Philos. Plants 61).
1753Chambers Cycl. Supp., Calyptra. 1777Robson Brit. Flora 26 A calyptra is the calyx of a Moss, covering the fructification like a hood. 1794Martyn Rousseau's Bot. xxxii. 493 A lidded capsule, covered with a smooth calyptre. 1807J. E. Smith Phys. Bot. 402 Mosses, which have..a hood-like corolla, or calyptra, bearing the style, and concealing the capsule. 1830Lindley Nat. Syst. Bot. 60 [Of the Mangrove Tribe] Calyx superior..with the lobes varying in number..occasionally all cohering in a calyptra. 1858Carpenter Veg. Phys. §736.
Add:2. [ad. F. calyptre (used in this sense by Van Tieghem & Douliot 1888, in Ann. des Sci. Nat.: Bot. VIII. 11).] A thickened membrane of parenchymatous cells which protects the growing root of a vascular plant; a root-cap.
1898H. C. Porter tr. Strasburger's Text-bk. Bot. 15 A root may always be distinguished from a stem by the root-cap or calyptra sheathing its apex. 1914M. Drummond tr. Haberlandt's Physiol. Plant Anat. ii. 93 The inner apical envelope of the rootlet, or ‘calyptra’ is produced by the rootlet itself. 1960C. R. Metcalfe Anat. Monocotyledons I. 581 Montemontini..refers to the occurrence of a sclerotic calyptra (Wurzelhaube) on the roots when young. |