IDNAME urn:idName:fossilplants.info:species:D92178A1-B10E-FA19-DCBD-B69B23F26ECB species
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Amyelon bogdense

Amyelon bogdense M. Wan, W. Yang, J. Wang Rev. Palaeobot. Palynol., 263: 14. 11 Jan 2019
Name
Amyelon bogdense
Rank
Species
Generic Name
[Genus] Amyelon
Authors (Pub.)
Wan M. Yang W. Wang J.  
Publication
Amyelon bogdense sp. nov., a silicified gymnospermous r...
Journal
Review of Palaeobotany and Palynology
Volume
263
Page number
14
Year
2019

Fossil Status
roots (wood)

Stratigraphy
Changhsingian
Strat. comment
Guodikeng Formation
Location
South Taodonggou, Turpan, Xinjiang Uygur Autonomous Region, China
Paleoregion
Kazakhstania (Xinjiang)
Data for Holotypus
Repository
Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, China
Repository Number
PB 22881, and the slide PB 22881-1
Data for Paratypus
Repository
Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, China
Repository Number
PB 22882–PB 22903, and the slides PB 22882-1 to PB 22903-1
Diagnosis
Root protostelic, bearing isolated or clusters of rootlets. Protostele diarch. Primary xylem exarch. Tracheids of primary xylem with helical and scalariform thickenings. Secondary xylem pycnoxylic, composed of radially arranged tracheids and parenchymatous rays. Tracheids rounded or polygonal, sometimes square in transverse section. Intercellular spaces present between tracheids. Radial pits uniseriate to tetraseriate, commonly triseriate, continuously and alternately arranged. Bordered pits circular to hexagonal in outline with rounded to oval apertures. Rays commonly uniseriate, rarely biseriate, 1–11 cells high, composed of procumbent parenchymatous cells. Cross-field pitting araucarioid-type. Each cross-field with 4–10, mostly 6–8 pits. Cross-field pits commonly circular, rarely oval, bordered with circular to elliptical apertures. Tangential tracheidal pits, axial parenchyma and ray tracheids absent. Secondary phloem composed of radially aligned thick-walled cells, axial parenchyma and parenchymatous rays. Phelloderm composed of parenchymatous cells with rounded, polygonal and elongated shape, and in variable sizes transversely and radially. Phellem composed of regular, brick-shaped parenchymatous cells, forming a continuous layer around the outermost of root axis. Rootlet protostelic, with diarch protostele, exarch primary xylem, pycnoxylic secondary xylem, phloem and periderm. Secondary xylem arranging as two wedge-shaped spokes. Spaces between spokes empty or filled with parenchyma.

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