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Cordaixylon dumusum
Cordaixylon dumusum G.W. Rothwell, S. Warner Bot. Gaz., 145(2): 277. Jun 1984
- Name
- Cordaixylon dumusum
- Rank
- Species
- Generic Name
- [Genus] Cordaixylon
- Authors (Pub.)
- Rothwell G. W.
Warner S.
- Publication
- Cordaixylon dumusum n.sp. (Cordaitales). I [1984/6]
- Journal
- Botanical Gazette
- Volume
- 145
- Issue
- 2
- Page number
- 277
- Year
- 1984
- Fossil Status
- leafy stems (with reproductive organs)
- Stratigraphy
- Kasimovian
- Strat. comment
- Conemaugh Group
- Location
- South side of Ohio route 22 (NE '/4, SE 1/4, SE 1/4, sec. 6, Wayne Town- ship, Jefferson County), ca. 8 km west of Steubenville, Ohio, USA
- Paleoregion
- Laurussia (Laurentia)
Data for Holotypus
- Repository
- Field Museum, Chicago, USA
- Repository Number
- OUP slide nos. 5489, 5490, 5503, 5522, 5524-5530, 5532, 5536, and 5557- 5604
- Diagnosis
- Shrublike plants with stems up to ca. 5 cm and profuse adventitious rooting from nod- al regions. Needle-like leaves at base of branches with spatulate leaves up to ca. 3 cm wide distally on some branches, needle-like leaves only on oth- ers. Phyllotaxis approaching 3/8, 5/13, and 8/21, with traces diverging from pith as single bundle in smaller stems and as double bundle in largest stems. Adventitious root traces not attached to primary xylem of stem or leaf, diverging at nodes distal to leaf trace and proximal to branch trace emission. Leaves hypostomatic with single rows of stomata. Leaf traces collateral, surrounded by distinct sheath and separated by compact, undifferentiated mesophyll. Leaf sclerenchyma of longitudinally oriented columns typically separated by two bundles; hypodermal sclerenchyma absent distal to leaf base. Cones irregularly arranged on both apical and proximal stem regions; xylem of cone axis often not continuous with xylem of stem. Pollen cones with five sporangia per cone scale, Florinites-type pollen 47-66 [im in greatest dimension.
