| 单词 |
prothallus |
| 释义 |
‖ prothallus Bot.|prəʊˈθæləs|
Pl. prothalli |-aɪ|.
[mod.L., f. pro-2 + Gr. θαλλός shoot: see thallus.]
= prothallium.
1854J. H. Balfour in Encycl. Brit. V. 144/1 Equisetaceæ... The spore when sprouting, produces a pro-embryo or pro-thallus, which at first appears as a green-lobed leaf supported on a stalk. 1857Berkeley Cryptog. Bot. §32. 45 The spores germinate and produce a more or less foliaceous mass, which after impregnation bears fruit containing bodies like the original spores, or a plant capable of bearing such spores, in which case it is called a prothallus. 1908Athenæum 16 May 608/1 The fern plant..is typically a land-plant... But one phase of its life-cycle, the small green prothallus or fore-plant, is essentially an aquatic phase. 1940Chambers's Techn. Dict. 680/1 The term prothallus is extended to cover homologous stages in the life-cycle of Gymnosperms. 1965K. R. Sporne Morphol. Gymnosperms i. 19 Cell-walls are being laid down between the nuclei of the female prothallus, a process which, in most gymnosperms, continues until the whole of the prothallus becomes circular. |
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