英文摘要 |
Gnetalean megafossils were accumulated in the last decade. Taxonomic positions of several of Ephedran megafossil species are, however, controversial, resulting in a complicated nomenclature. Liaoxia Z.Y. Cao & S.Q. Wu, “Eragrostis Z.Y. Cao & S.Q. Wu”, “Chaoyangia Duan”, and their type species “Liaoxia cheniae Z.Y. Cao & S.Q. Wu”, “Eragrostis changii Z.Y. Cao & S.Q. Wu”, “Chaoyangia liangii S.Y. Duan”, were not validly published in the original publication under the Vienna Code. The species “Liaoxia cheniae Z.Y. Cao & S.Q. Wu” was validly published as Ephedrites cheniae S.X. Guo & X.W. Wu but later combined into Liaoxia cheniae (S.X. Guo & X.W. Wu) Z.Y. Cao & S.Q. Wu and further into Ephedra cheniae (S.X. Guo & X.W. Wu) H.M. Liu et al. Some uncertain morphological characters are fundamental to elucidate the taxonomic position of Ephedrites cheniae S.X. Guo & X.W. Wu and “Chaoyangia liangii S.Y. Duan”, e.g. bract number, position, and connation in female cones, seed number and position in a female cone, and morphology of the furcated appendages of reproductive organs of “Chaoyangia liangii S.Y. Duan”. |