| 单词 | oospore |
| 例句 | L, M, N, Fertilization of the oogonium and development of the oospore in Peronospora. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z The oospores give rise to neuter plants, the tetraspores to ♂ or ♀ plants. The New Gresham Encyclopedia Volume 4, Part 1: Deposition to Eberswalde 2011-04-14T02:00:57.977Z After the evacuation of the antheridia the gonospheres are found to be covered with cellulose; they then constitute so many oospores, with solid walls. Fungi: Their Nature and Uses After impregnation the fertilized oosphere immediately surrounds itself with a cell-wall and becomes the oospore which by a process of growth forms the embryo of the new plant. Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1 In 1856 Pringsheim described the true sexual propagation by oospores, with such minuteness and accuracy that our knowledge of the plant can scarcely be said to have essentially increased since that time. Scientific American Supplement, No. 460, October 25, 1884 The oospore on germination usually gives origin to a zoosporangium, but may form directly a germ tube which infects the host. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z The product of the union of an antherozoid and an oosphere is termed an oospore. Scientific American Supplement, No. 531, March 6, 1886 The oospores of the Saprolegniæ, when arrived at maturity, possess a tolerably thick double integument, consisting of an epispore and an endospore. Fungi: Their Nature and Uses Moreover, as in the Peronospora, conjugation may take place and result in an oospore; the contents of which divide and are set free as monadiform germs. Discourses Biological and Geological Essays After the production of this oospore the parent filament gradually loses its vitality and slowly decays. Scientific American Supplement, No. 460, October 25, 1884 C. Formation of zoospores by oospores. z, Free zoospores. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z But the asexual generation derived from the oospore only for a short while remains in connection with the prothallium, which, of course, answers to the leafy portion of the moss. Scientific American Supplement, No. 531, March 6, 1886 Its extremity never opens, and we never find antherozoids; on the contrary, the antheridium presents, up to the maturity of the oospore, the appearance which it presented at the moment of fecundation. Fungi: Their Nature and Uses Two separate portions of its protoplasm become fused together, surround themselves with a thick coat and give rise to a sort of vegetable egg called an oospore. Discourses Biological and Geological Essays These contents are now gradually forming themselves into the spore or "gonidium," as Carpenter calls it, in distinction from the true sexual spores, which he terms "oospores." Scientific American Supplement, No. 460, October 25, 1884 The oospore becomes an oosporangium, and from it at least a hundred germinating bodies are at length expelled. Fungi: Their Nature and Uses Reproduction from an oospore formed by the combination of two sexual cells. Scientific American Supplement, No. 531, March 6, 1886 This oospore, or resting spore, may remain dormant in this state within the tissues of the foster plant for some months. Fungi: Their Nature and Uses After a period of rest, the contents of the oospore break up into a number of zoospores like those already described, each of which, after a period of activity, germinates in the ordinary way. Discourses Biological and Geological Essays |
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