The INTERNATIONAL FOSSIL PLANT NAMES INDEX
Global registry of scientific names of fossil organisms covered by the International Code of Nomenclature for Algae, Fungi, and Plants and the International Code of Zoological Nomenclature © 2014-2022

IDNAME urn:idName:ifpni.org:genus:95545094-00B5-4988-87E5-4B2CA4A35DB7 genus
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Yuguangia

Genus Yuguangia S.-G. Hao, J.-Z. Xue, Q. Wang Int. J. Pl. Sci., 168(8): 1163. Oct 2007
Name
Yuguangia
Rank
Genus
Authors (Pub.)
Hao S.-G. Xue J.-Z. Wang Q.  
Publication
Yuguangia ordinata gen. et sp. nov., a new lycopsid from the Middle Devonian (Late Givetian) of Yunnan, China, and its phylogenetic implications [2007/10]
Journal
International Journal of Plant Sciences
Volume
168
Issue
8
Page number
1163
Year
2007
Parent Taxon
[Class] Lepidodendropsida
Fossil Status
stems (with sporangia)
Type
Yuguangia ordinata
Diagnosis
Small, heterosporous, ligulate lycopsid. Stems branch isotomously. Vegetative leaves persistent, consisting of pedicels and laminae. Leaf base decurrent, obovate or fusiform in shape, arranged in pseudowhorls. Distal shoots, vegetative or fertile (strobilate), isotomously branched. Bisporangiate strobili, megasporophylls occurring at proximal and microsporophylls at distal parts. Sporophylls, closely arranged in pseudowhorls, distinctly differentiated into an horizontal pedicel, an upturned lamina, and a downward ‘‘heel.’’ Megasporangia and microsporangia homomorphic, obovoid, round to elliptical in shape. Each sporophyll with one adaxial mega- or microsporangium. Each megasporangium contains four or more Trileites-type megaspores. A ligule at the distal end of the horizontal pedicel. Megaspores, spherical in shape, slightly coarse or finely rugulate in surface. Acinosporitestype microspores, rounded triangular, with curvaturae perfectae, equatorially and distally thick exine, and biform ornamentation on distal surface. Anatomy of distal axes shows an exarch primary xylem strand, a phloem zone, and a two-zoned cortex. Protoxylem tracheids with annular and helical thickenings; metaxylem tracheids with scalariform thickenings having perforate layers connecting the adjacent bars
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