NOTES ON FAGACEAE(Ⅰ)
Huang Cheng-chiu, Chang Yong-tian
1986, 6(2):
101-106.
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Our paper, Notes on Fagaceae, is prepared for the compilation of the Flora Reipublicae Popularis Sinicae, and separated into parts, shall be published subsequently. It deals with members of the family, not all, but most of them, from China,and still a few from other countries. The reason is, one would have known, that plant species as well as the moving animals,no national boundaries could keep their limits in distribution,particular to those elements not only very widespread but also markedly discontinous. On the whole, we would prefer taking the treatment of genera and species is conservative. At generic level, for examples, Pasania Oerst. and Cyclobalanopsis Oerst. shall not separated from Lithocarpus Bl. and Quercus L. respectively. In additions to the new combinations here made, new taxa described and descriptionae addendae to some taxa, which had been published previously, discussions and critical notes on those so long had been made misleading or misinterpretation and those of species mixta, dubia and etc. here also given. In this present paper, Trigonobalanus doichangensis is reported once again after Hsu et al. (1981). The plant was found in Sze-Mao, where situates in due south of Yunnan and not far from Laos. The former record reported that it was found in Ling-Tschan, south-west Yunnan, where borders on Burma. We believe comprehensively that T. doichangensis must has been surving in both Laos and Burma, since this species was discovered initially in Thailand. On the fact that the third species T. excelsa is discovered in Colombia, Melville (1982) expressed his view on the pheno-menon of discontinuity in distribution of this genus to-day in the present separation between the continents of Asia and South America. We agree the reasonable explanation given by Melville in accepting the continental drift theory and thence he recons-tructed map of the West Gandwanaland Peninsula of the Permian while he opposing Lozano et al. (1980) and some authors had previously assumed that when the Bering land-bridge became available in the Pliocene, as suggested by Raven & Axelrod (1974) Trigonobalanus migrated northwards from south-east Asia passed into North America and then along the Panama isthmus into South America. We take advantage here of the occasion in order to call attention to the fact that there are another two genera of the most primitive family of Angiosperms i. e. Talauma Juss. and Dugeniodendron Lozano of Magnoliaceae. A large number of species of these two genera occur in south-eastAsian, at the same time, they occupied an area very similar to that of Trigonobalanus in distribution in both hemispheres(Liu 1984). The componant of the genus Dugeniodendron is a group which compries of few species belonged formerly to Talau-ma and Magnolia, as these species possess.distinguishing chara-cteristics that had better separated from the two genera and betreated as an independent genus as G. Lezano has been done.
