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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.
