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:species:EA835E5F-53C4-4367-9073-C0FF132C0B4E species
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Yiduxylon trilobum

Yiduxylon trilobum De-M. Wang, L. Liu BMC Evol. Biol., 15(28): 8. 26 Feb 2015
Name
Yiduxylon trilobum
Rank
Species
Generic Name
[Genus] Yiduxylon
Authors (Pub.)
Wang D.-M. Liu L.  
Publication
A new Late Devonian genus with seed plant affinities [2015/2]
Journal
BMC Evolutionary Biology
Volume
15
Issue
28
Page number
8
Year
2015
Fossil Status
stems
Stratigraphy
Famennian
Strat. comment
Tizikou Formation
Location
Tizikou, Maohutang village, Wangjiafan Town, Yidu City, Hubei Province, China
Paleoregion
Cathaysia (South)
Data for Holotypus
Repository
Beijing University, Department of Geology, Beijing, China
Repository Number
Slide HBY-02
Diagnosis
Stems 7.2-20 mm in diameter and attached by fronds at 45-60°. Frond rachises 5.2-10 mm and 4.8-6.3 mm in diameter before and after proximal bifurcation at about 60°, respectively. Narrow and longitudinally parallel superficial ridges and grooves alternating on stems and rachises of fronds and primary pinnae. Primary pinna rachises 1.8-2.6 mm in diameter. Secondary pinna borne at about 90°, with rachises 0.8-1.3 mm in diameter, and bearing pinnules at 45-90°. Pinnules up to 21.7 mm long and about 19.4 mm wide, with each unequally dividing into four or more units that are anisotomous twice or thrice. Ratio of primary xylem diameter to stem diameter 1/5. Stem primary xylem 1.8-2.0 mm in diameter, with three undivided ribs varying in length and becoming narrower towards stelar center. Secondary xylem up to 5.2 mm thick. Rays 2–6 cells wide and more than 120 cells high. Cortex 0.8-1.1 mm thick and inner cortex lacking sclerotic clusters. Individual leaf traces circular or slightly oval with two protoxylem strands. At petiole base, each C-shaped group of two vascular bundles asymmetrical with inner bundle tending to divide into three portions.
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