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Metasequoia occidentalis : ウィキペディア英語版
Metasequoia occidentalis

''Metasequoia occidentalis'' is an extinct redwood species of the family Cupressaceae that is found as fossils throughout the Northern Hemisphere. It is one of three extinct species of ''Metasequoia'' that are currently recognized as valid.〔Stockey, R.A., Rothwell, G.W. and Falder, A.B. 2001. Diversity among taxodioid conifers: ''Metasequoia foxii'' sp. nov. from the Paleocene of central Alberta, Canada. International Journal of Plant Science, v. 162, p. 221-234.〕〔Liu, Y-J, Li, C-S, and Wang, Y-F, 1999. Studies on fossil ''Metasequoia'' from north-east China and their taxonomic implications. Botanical Journal of the Linnaean Society, v. 130, p. 267-297.〕
==History==

Fossilized ''Metasequoia''-like remains were noted in Europe and North America as long ago as the 1800s but were assigned to a variety of other genera such as ''Sequoia'' (redwoods) and ''Taxodium'' (bald cypresses). It was not until living ''Metasequoia'' trees (''Metasequoia glyptostroboides'') were discovered and described from a remote area of China during the 1940s that true affinity of most of these fossils became apparent.〔Chaney, R.W., 1948. Redwoods around the Pacific basin. Pacific Discovery. v. 1, no. 5, p. 4-14.〕〔Fulling, E.H. 1976. ''Metasequoia'' – fossil and living. The Botanical Review, v. 42, p. 215-315.〕
The species ''M. occidentalis'' is based on fossils that were originally described as ''Taxodium occidentale'' by J.S. Newberry in 1863. In 1951 they were reassigned as ''M. occidentalis'' by R.W. Chaney based on their close resemblance to living ''Metasequoia''.〔Chaney, R.W., 1951. A revision of fossil ''Sequoia'' and ''Taxodium'' in western North America based on the recent discovery of ''Metasequoia''. Transactions of the American Philosophical Society, v. 40, pt. 3 (1950), p. 171-263.〕 It has been said that, with few exceptions, the bulk of the fossils described in the literature indicate that ''M. occidentalis'' was indistinguishable from living ''Metasequoia glyptostroboides''.〔

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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