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A new microphyllous plant from the Lower Devonian of Yunnan Province, China

Li, Cheng-Sen and Edwards, Dianne 1997. A new microphyllous plant from the Lower Devonian of Yunnan Province, China. American Journal of Botany 84 (10) , pp. 1441-1448. 10.2307/2446142

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Sterile and fertile shoots of a microphyllous vascular plant are described from the Lower Devonian Posongchong Formation (? upper Siegenian), Yunnan Province, southern China and placed in the new taxon Halleophyton zhichangense gen. et sp. nov. The sterile axes are characterized by conspicuous, contiguous swollen rhomboidal to hexagonal leaf bases and relatively broad spatulate laminae. The relief of the leaf bases is not so pronounced in the fertile areas, which bear numerous cauline sporangia with two equal valves. In vegetative characters the new fossils, although smaller and more fragmentary, resemble Drepanophycus gaspianus but in the absence of information on the fertile parts of the latter and because of the controversy surrounding the concept of the genus Drepanophycus, we decided to erect a new genus. Its relationship to the lycophytes sensu stricto is equivocal as exact details of the relationship of sporangium with leaf and sporangium vascularization remain unknown.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: Q Science > QE Geology
Q Science > QK Botany
Publisher: Botanical Society of America
ISSN: 0002-9122
Last Modified: 04 Jun 2017 02:09

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