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- W2021108474 abstract "IN our previous notice (vol. xxxii. p. 289) of this important work we traced the evolution of gymnosperms down to a certain point. Prof. Williamson soon afterwards communicated the chief point of difference between his views and those of our authors, in a very interesting letter (NATURE, vol. xxxii. p. 364). We were not able at the time to follow the subject farther, awl this was of less consequence, as the points at issue, though extremely important in themselves, are not claimed to be in the direct line of evolution of the existing phanerogams. The palæozoic heterosporous cryptogams, with exogenous stems, are chiefly interesting, from the evolutionary standpoint, for the light they throw on what must probably have been the structure of the common ancestors, from which they, as well as the gymnosperms, were derived. A résumé of what is known regarding the ancestry of the Eocene Coniferæ will shortly be published by the Palæontographical Society, the compilation of much of which has been directly assisted by Prof. Williamson himself, and has also been revised in part by Mr. Carruthers. As it is not claimed by Saporta and Marion in any way that angiosperms have been evolutionised from gyrnnosperrns, even through the Gnetaceæ, it is unnecessary to pursue that branch of the subject farther now. The interest of the work centres, in fact, in the attempt to trace the ancestry of the monocotyledons and dicotyledons, groups which to ordinary observers seem to appear with startling abruptness in the geological record. L'Évolution des Phanérogames. Par MM. Saporta Marion. Second Notice. (Paris: Alcan, Boulevard St. Germain, 1885.)" @default.
- W2021108474 created "2016-06-24" @default.
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- W2021108474 date "1886-02-01" @default.
- W2021108474 modified "2023-10-18" @default.
- W2021108474 title "The Evolution of the Phanerogams" @default.
- W2021108474 doi "https://doi.org/10.1038/033388a0" @default.
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