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Cordaites validus
Cordaites validus L.M. Cohen, Delev. Amer. J. Bot., 46(7): 547. 28 Jul 1959
- Name
- Cordaites validus
- Rank
- Species
- Generic Name
- [Genus] Cordaites
- Authors (Pub.)
- Cohen L. M.
Delevoryas T.
- Publication
- An occurrence of Cordaites in the Upper Pennsylvanian of Illinois [1959/7]
- Journal
- American Journal of Botany
- Volume
- 46
- Issue
- 7
- Page number
- 547
- Year
- 1959
- Fossil Status
- stems (wood)
- Stratigraphy
- Pennsylvanian
- Location
- E Calhoun, Richland County, Illinois, USA
- Paleoregion
- Laurussia (Laurentia)
Data for Holotypus
- Repository
- Yale Peabody Museum of Natural History, New Haven, USA
- Repository Number
- Coal ball 40
- Diagnosis
- Stem with endarch primary xylem throughout the stele, protoxylem bordering on vertical rows of large parenchyma cells 50-60t in diameter, small pith cells associated with a vascular bundle forming a crescent-shaped mass internal to the large paren- chyma cells and primary xylem. Primary xylem annular, spiral, and scalariform in a narrow tran- sition zone. Secondary xylem with tracheids hav- ing circular bordered pitg on their radial walls; bordered pits usually uniseriate, seldom more than biseriate; rays uniseriate, usually 1-2 cells in height; pitting on tracheid-ray cell contact faces in clusters; borders on tracheid side narrower than those of ordinary bordered pits. Endarch leaf trace undivided at edge of pith, dividing into several strands in cortex and leaf base.
Nomenclatural synonyms
Species
