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 © 2014-2024

IDNAME urn:idName:ifpni.org:species:FBB74099-B396-4C69-B823-4149A9B7CAA8 species
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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.

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